Remove redundant closure aliases

'mw' are '$' are globals, always have been, and aren't going
anywhere. They're every bit as real as their longer versions.
If anything, the longer ones are less "real" or 'stable" because
they're not used internally by RL and easier to accidentally
replace or override. For anecdotes and history, see 91f950d6b0.

Change-Id: I526fb8c961d9477992d88f2780a0ff4cbdc51923

resources/js/ext.uls.displaysettings.js

@@ -17,7 +17,7 @@
  * @licence MIT License
  */
 
-( function ( $, mw ) {
+( function () {
 	'use strict';
 
 	var template = '<div class="uls-display-settings">' +
@@ -733,4 +733,4 @@
 	$.fn.languagesettings.modules = $.extend( $.fn.languagesettings.modules, {
 		display: DisplaySettings
 	} );
-}( jQuery, mediaWiki ) );
+}() );