GUAC-1480: Fix broken menu clipboard regression.

guacamole/src/main/webapp/app/client/directives/guacClient.js

@@ -413,11 +413,9 @@ angular.module('client').directive('guacClient', [function guacClient() {
             };
 
             // Update remote clipboard if local clipboard changes
-            $scope.$on('guacClipboard', function onClipboard(event, mimetype, data) {
-                if (client && data !== $scope.client.clipboardData) {
+            $scope.$watch('client.clipboardData', function clipboardChanged(data) {
+                if (client)
                     client.setClipboard(data);
-                    $scope.client.clipboardData = data;
-                }
             });
 
             // Translate local keydown events to remote keydown events if keyboard is enabled