Revert "search valid usernames and hashtags"

This reverts commit d75cf96f25.

js/twister_following.js

@@ -367,19 +367,13 @@ function userSearchKeypress(item) {
         // Enter pressed
         var dummy = $('<a></a>');
         if (prefix == '#') { // hashtag
-            partialName = _extractHashtag(partialName);
-            if (partialName) {
             dummy.attr('href', $.MAL.hashtagUrl(partialName));
             dummy.text('#' + partialName);
             openHashtagModal.call(dummy.get(0), item);
-            }
         } else { // username
-            partialName = _extractUsername(partialName);
-            if (partialName) {
             dummy.attr('href', $.MAL.userUrl(partialName));
             openProfileModal.call(dummy.get(0), item);
         }
-        }
         return false;
     }