fix some win32 issues

Yuhang Zhao

2023-12-27 e5370435a9d4297d0ba227f2237d7ed16bba7e82

 examples/mainwindow/mainwindow.h

@@ -33,7 +33,6 @@
    Theme currentTheme{};

    QWK::WidgetWindowAgent *windowAgent;
    QWK::StyleAgent *styleAgent;
};

#endif // MAINWINDOW_H