Remove autocomplete from artists collage.

* URLs are used on the artist collage page, not names.
* Also removed unused artistsimilar autocomplete.

static/functions/autocomplete.js

     serviceUrl : ARTIST_AUTOCOMPLETE_URL,
   });
 
-  if (url.path == 'torrents' || url.path == 'upload' || url.path == 'artist' || (url.path == 'requests' && url.query['action'] == 'new') || url.path == 'collages') {
+  if (url.path == 'torrents' || url.path == 'upload' || url.path == 'artist' || (url.path == 'requests' && url.query['action'] == 'new')) {
     $("#artist" + SELECTOR).autocomplete({
       deferRequestBy: 300,
       serviceUrl : ARTIST_AUTOCOMPLETE_URL
     });
-    $("#artistsimilar" + SELECTOR).autocomplete({
-      deferRequestBy: 300,
-      serviceUrl : ARTIST_AUTOCOMPLETE_URL
-    });
   }
   if (url.path == 'torrents' || url.path == 'upload' || url.path == 'collages' || url.path == 'requests' || url.path == 'top10' || (url.path == 'requests' && url.query['action'] == 'new')) {
     $("#tags" + SELECTOR).autocomplete({