Fix garbage collect call

hybrid_server/classes/mvkcontroller.xml

@@ -354,7 +354,7 @@
                     <state id="mvs_GC">
                         <onentry>
                             <script>
-                                self.mvs.garbage_collect()
+                                self.mvs.purge()
                             </script>
                             <raise scope="broad" event="resume_task"/>
                         </onentry>