call controlUtils.disposeControls in popup.js (#5537)

#5112 adds the necessary cleanup for the formwidget but 'dispose-control' listener is not triggered when a popup is closed

modules/system/assets/ui/js/popup.js

@@ -145,6 +145,7 @@
 
         this.$modal.on('hidden.bs.modal', function(){
             self.triggerEvent('hidden.oc.popup')
+            $.oc.foundation.controlUtils.disposeControls(self.$container.get(0))
             self.$container.remove()
             $(document.body).removeClass('modal-open')
             self.dispose()