Fix twitch name

Summary: fix spelling

Test Plan: i didn't test this, but seems ok?

Reviewers: epriestley, btrahan

Reviewed By: epriestley

CC: Korvin, aran

Differential Revision: https://secure.phabricator.com/D6728

src/applications/auth/provider/PhabricatorAuthProviderOAuthTwitch.php

@@ -30,7 +30,7 @@ final class PhabricatorAuthProviderOAuthTwitch
   }
 
   protected function getLoginIcon() {
-    return 'Twitch';
+    return 'TwitchTV';
   }
 
 }