Add ext.uls.messages as dependency for ext.uls.mediawiki

Turns out the messages for language selector were not loading
in Special:MainPage. This fixes that as well as cleaning up the
dependencies.

Change-Id: Ice8dcf1b2e878a0fe3cd0e002a9b1cff2f1901dd

resources/js/ext.uls.interface.js

@@ -421,7 +421,7 @@
 							mw.hook( 'mw.uls.settings.open' ).fire( eventParams && eventParams.source || 'personal' );
 						}
 					} else {
-						mw.loader.using( ['ext.uls.mediawiki', 'jquery.uls.grid'], function () {
+						mw.loader.using( 'ext.uls.mediawiki', function () {
 							$ulsTrigger.uls( {
 								quickList: function () {
 									return mw.uls.getFrequentLanguageList();