[fix] html escape url

searx/templates/default/result_templates/default.html

     <h3 class="result_title"><a href="{{ result.url }}">{{ result.title|safe }}</a></h3>
     <p class="url">{{ result.pretty_url }} <a class="cache_link" href="https://web.archive.org/web/{{ result.url }}">cached</a></p>
 	{% if result.publishedDate %}<p class="published_date">{{ result.publishedDate }}</p>{% endif %}
-    <p class="content">{% if result.img_src %}<img src="{{ result.img_src|safe }}" class="image" />{% endif %}{% if result.content %}{{ result.content|safe }}<br class="last"/>{% endif %}</p>
+    <p class="content">{% if result.img_src %}<img src="{{ result.img_src }}" class="image" />{% endif %}{% if result.content %}{{ result.content|safe }}<br class="last"/>{% endif %}</p>
   </div>
 </div>