Reduce the number of network calls done by RobotUnitGui

source/RobotAPI/gui-plugins/RobotUnitPlugin/QWidgets/NJointControllersWidget.cpp

@@ -108,9 +108,9 @@ namespace armarx
 
     void NJointControllersWidget::onPushButtonStopAll_clicked()
     {
-        for (auto& pair : entries)
+        if(robotUnit)
         {
-            pair.second->deactivateController();
+            robotUnit->switchNJointControllerSetup({});
         }
     }