The JoystickWidget now has a parent so that it gets cleaned up when the...

The JoystickWidget now has a parent so that it gets cleaned up when the MainWindow is closed preventing zombie-dialog syndrome.

src/ui/MainWindow.cc

@@ -1520,7 +1520,7 @@ void MainWindow::configure()
         {
             joystick->start();
         }
-        joystickWidget = new JoystickWidget(joystick);
+        joystickWidget = new JoystickWidget(joystick, this);
     }
     joystickWidget->show();
 }