Remove unrelated change that mistakenly ended up into this branch

searx/settings.yml

     engine : wolframalpha_noapi
     timeout: 6.0
     categories : science
-    
-  - name : urbandictionary
-    engine        : xpath
-    search_url    : http://www.urbandictionary.com/define.php?term={query}
-    url_xpath     : //*[@class="word"]/@href
-    title_xpath   : //*[@class="word"]
-    content_xpath : //*[@class="meaning"]
-    shortcut : ud
 
   - name : dictzone
     engine : dictzone