make MainWindow cat update instantly

Signed-off-by: Tayou <tayou@gmx.net>

launcher/ui/MainWindow.h

@@ -90,6 +90,8 @@ protected:
 private slots:
     void onCatToggled(bool);
 
+    void onCatChanged(int);
+
     void on_actionAbout_triggered();
 
     void on_actionAddInstance_triggered();