libs/JQM: fix filter not allowing preventDefault until PR is merged

ext/libs/jquery-mobile/jquery-mobile.js

-/* HACKS: #7155, #7162
+/* HACKS: #7155, #7162, #7154
 /*!
 * jQuery Mobile 1.4.3pre
 * Git HEAD hash: 77b5304ec0510824e6f014e6caf716701db6abd2 <> Date: Thu Mar 6 2014 16:14:07 UTC
@@ -13671,7 +13671,9 @@ $.widget( "mobile.filterable", {
       }
 
       this._timer = this._delay( function() {
-        this._trigger( "beforefilter", null, { input: search } );
+        if ( this._trigger( "beforefilter", null, { input: search } ) === false ) {
+          return false;
+        }
 
         // Change val as lastval for next execution
         search[ 0 ].setAttribute( "data-" + $.mobile.ns + "lastval", val );
@@ -13882,7 +13884,7 @@ $.widget( "mobile.filterable", $.mobile.filterable, {
       // Also trigger listviewbeforefilter if this widget is also a listview
       this._widget._trigger( "beforefilter", event, data );
     }
-    this._super( type, event, data );
+    return this._super( type, event, data );
   },
 
   _setWidget: function( widget ) {