Fix: Reactivate contextmenu of feature treeviews

CityDoctorParent/Extensions/CityDoctorGUI/src/main/java/de/hft/stuttgart/citydoctor2/gui/MainWindow.java

@@ -820,8 +820,11 @@ public class MainWindow extends Application {
         MenuItem deleteOption = new MenuItem(Localization.getText("MainWindow.delete"));
         deleteOption.setOnAction(ae -> controller.delete(featureView.getSelectionModel().getSelectedItem()));
         menu.getItems().add(deleteOption);
-        featureView.setContextMenu(menu);
+
      */
+
+        featureView.setContextMenu(menu);
+
     }
 
     public void fetchCopyAction(Renderable node) {