Autocomplete: Update categories demo again, use only public properties to update menu option

Author: jzaefferer

demos/autocomplete/categories.html

@@ -23,7 +23,7 @@
 	$.widget( "custom.catcomplete", $.ui.autocomplete, {
 		_create: function() {
 			this._super();
-			this.menu.option( "items", "> :not(.ui-autocomplete-category)" );
+			this.widget().menu( "option", "items", "> :not(.ui-autocomplete-category)" );
 		},
 		_renderMenu: function( ul, items ) {
 			var that = this,