Fix results with no scheme

Related to #428, which was fixed in e3df22b but broken in a refactoring
(b6c3cb0)

searx/results.py

         # if the result has no scheme, use http as default
         if not result['parsed_url'].scheme:
             result['parsed_url'] = result['parsed_url']._replace(scheme="http")
+            result['url'] = result['parsed_url'].geturl()
 
         result['host'] = result['parsed_url'].netloc