Replace $( document ).ready(...) by $(...)

In jQuery 3 $(document).ready(...) is deprecated.
https://jquery.com/upgrade-guide/3.0/#deprecated-document-ready-handlers-other-than-jquery-function

Change-Id: I1a9f578d8cf8fa2d9dd38a1b2d3a0b3c32914b74

resources/js/ext.uls.webfonts.mobile.js

@@ -28,7 +28,7 @@
 	mediawikiFontRepository.base = mw.config.get( 'wgExtensionAssetsPath' ) +
 		'/UniversalLanguageSelector/data/fontrepo/fonts/';
 
-	$( document ).ready( function () {
+	$( function () {
 		// MediaWiki specific overrides for jquery.webfonts
 		$.extend( $.fn.webfonts.defaults, {
 			repository: mediawikiFontRepository,