make the swap emphasis hotkey update the checked screen sizing (#2540)

Author: guidocella

src/frontend/qt_sdl/Window.cpp

@@ -2244,6 +2244,7 @@ void MainWindow::onScreenEmphasisToggled()
         currentSizing = screenSizing_EmphTop;
     }
     windowCfg.SetInt("ScreenSizing", currentSizing);
+    actScreenSizing[currentSizing]->setChecked(true);
 
     emit screenLayoutChange();
 }