[fix] add missing scheme to duplicated results too ++ revert gigablasts handling

searx/engines/gigablast.py

     # parse results
     for result in dom.xpath(results_xpath):
         url = result.xpath(url_xpath)[0].text
-        if not url.startswith('http://') and not url.startswith('https://'):
-            url = 'http://' + url
         title = result.xpath(title_xpath)[0].text
         content = escape(result.xpath(content_xpath)[0].text)
 

searx/search.py

 
         res['parsed_url'] = urlparse(res['url'])
 
+        # if the result has no scheme, use http as default
+        if not res['parsed_url'].scheme:
+            res['parsed_url'] = res['parsed_url']._replace(scheme="http")
+
         res['host'] = res['parsed_url'].netloc
 
         if res['host'].startswith('www.'):
         # if there is no duplicate found, append result
         else:
             res['score'] = score
-            # if the result has no scheme, use http as default
-            if res['parsed_url'].scheme == '':
-                res['parsed_url'] = res['parsed_url']._replace(scheme="http")
 
             results.append(res)