follow up blocked_engines renaming in templates

searx/templates/courgette/preferences.html

                     <td>{{ search_engine.name }} ({{ shortcuts[search_engine.name] }})&lrm;</td>
                     <td>{{ _(categ) }}</td>
                     <td class="engine_checkbox">
-                        <input type="checkbox" id="engine_{{ categ|replace(' ', '_') }}_{{ search_engine.name|replace(' ', '_') }}" name="engine_{{ search_engine.name }}__{{ categ }}"{% if (search_engine.name, categ) in blocked_engines %} checked="checked"{% endif %} />
+                        <input type="checkbox" id="engine_{{ categ|replace(' ', '_') }}_{{ search_engine.name|replace(' ', '_') }}" name="engine_{{ search_engine.name }}__{{ categ }}"{% if (search_engine.name, categ) in disabled_engines %} checked="checked"{% endif %} />
                         <label class="allow" for="engine_{{ categ|replace(' ', '_') }}_{{ search_engine.name|replace(' ', '_') }}">{{ _('Allow') }}</label>
                         <label class="deny" for="engine_{{ categ|replace(' ', '_') }}_{{ search_engine.name|replace(' ', '_') }}">{{ _('Block') }}</label>
                     </td>

searx/templates/default/preferences.html

                 <td>{{ search_engine.name }} ({{ shortcuts[search_engine.name] }})&lrm;</td>
                 <td>{{ _(categ) }}</td>
                 <td class="engine_checkbox">
-                    <input type="checkbox" id="engine_{{ categ|replace(' ', '_') }}_{{ search_engine.name|replace(' ', '_') }}" name="engine_{{ search_engine.name }}__{{ categ }}"{% if (search_engine.name, categ) in blocked_engines %} checked="checked"{% endif %} />
+                    <input type="checkbox" id="engine_{{ categ|replace(' ', '_') }}_{{ search_engine.name|replace(' ', '_') }}" name="engine_{{ search_engine.name }}__{{ categ }}"{% if (search_engine.name, categ) in disabled_engines %} checked="checked"{% endif %} />
                     <label class="allow" for="engine_{{ categ|replace(' ', '_') }}_{{ search_engine.name|replace(' ', '_') }}">{{ _('Allow') }}</label>
                     <label class="deny" for="engine_{{ categ|replace(' ', '_') }}_{{ search_engine.name|replace(' ', '_') }}">{{ _('Block') }}</label>
                 </td>

searx/templates/oscar/preferences.html

                             {% if not search_engine.private %}
                                 <tr>
                                     {% if not rtl %}
-                                    <td>{{ checkbox_toggle('engine_' + search_engine.name|replace(' ', '_') + '__' + categ|replace(' ', '_'), (search_engine.name, categ) in blocked_engines) }}</td>
+                                    <td>{{ checkbox_toggle('engine_' + search_engine.name|replace(' ', '_') + '__' + categ|replace(' ', '_'), (search_engine.name, categ) in disabled_engines) }}</td>
                                     <th>{{ search_engine.name }}</th>
 				    <td>{{ shortcuts[search_engine.name] }}</td>
 				    <td><input type="checkbox" {{ "checked" if search_engine.safesearch==True else ""}} readonly="readonly" disabled="disabled"></td>
 				    <td><input type="checkbox" {{ "checked" if search_engine.safesearch==True else ""}} readonly="readonly" disabled="disabled"></td>
 				    <td>{{ shortcuts[search_engine.name] }}</td>
                                     <th>{{ search_engine.name }}</th>
-                                    <td>{{ checkbox_toggle('engine_' + search_engine.name|replace(' ', '_') + '__' + categ|replace(' ', '_'), (search_engine.name, categ) in blocked_engines) }}</td>
+                                    <td>{{ checkbox_toggle('engine_' + search_engine.name|replace(' ', '_') + '__' + categ|replace(' ', '_'), (search_engine.name, categ) in disabled_engines) }}</td>
                                     {% endif %}
                                 </tr>
                             {% endif %}

searx/templates/pix-art/preferences.html

             <tr>
                 <td>{{ search_engine.name }} ({{ shortcuts[search_engine.name] }})&lrm;</td>
                 <td class="engine_checkbox">
-                    <input type="checkbox" id="engine_{{ categ|replace(' ', '_') }}_{{ search_engine.name|replace(' ', '_') }}" name="engine_{{ search_engine.name }}__{{ categ }}"{% if (search_engine.name, categ) in blocked_engines %} checked="checked"{% endif %} />
+                    <input type="checkbox" id="engine_{{ categ|replace(' ', '_') }}_{{ search_engine.name|replace(' ', '_') }}" name="engine_{{ search_engine.name }}__{{ categ }}"{% if (search_engine.name, categ) in disabled_engines %} checked="checked"{% endif %} />
                     <label class="allow" for="engine_{{ categ|replace(' ', '_') }}_{{ search_engine.name|replace(' ', '_') }}">{{ _('Allow') }}</label>
                     <label class="deny" for="engine_{{ categ|replace(' ', '_') }}_{{ search_engine.name|replace(' ', '_') }}">{{ _('Block') }}</label>
                 </td>

searx/webapp.py

                   language_codes=language_codes,
                   engines_by_category=categories,
                   stats=stats,
-                  blocked_engines=disabled_engines,
+                  disabled_engines=disabled_engines,
                   autocomplete_backends=autocomplete_backends,
                   shortcuts={y: x for x, y in engine_shortcuts.items()},
                   themes=themes,