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

tests/webfonts.html

@@ -11,7 +11,7 @@
 	<script src="../lib/jquery.uls/src/jquery.uls.data.utils.js"></script>
 	<script src="../resources/js/ext.uls.webfonts.repository.js"></script>
 	<script>
-		$( document ).ready( function () {
+		$( function () {
 			var $webfonts, fonts, languages, $fontSelector, $langselector;
 
 			$( 'div#webfonts-preview-area' ).webfonts( {