Remove duplicated handling of /url result links

It appears that result links beginning with '/url' were mistakenly
commited with an inefficient filtering process in its place. With the
way the code is structured, this less effective '/url' link filter took
precedence over the previous link filter, and also caused users with the
"open link in new tab" config enabled to no longer have access to that
feature.

Fixes #769

app/filter.py

@@ -433,10 +433,6 @@ class Filter:
             # Internal google links (i.e. mail, maps, etc) should still
             # be forwarded to Google
             link['href'] = 'https://google.com' + q
-        elif link['href'].startswith('/url'):
-            link['href'] = q
-            if self.config.new_tab:
-                link['target'] = '_blank'
         elif q.startswith('https://accounts.google.com'):
             # Remove Sign-in link
             link.decompose()