Fix mainwindow example

Sine Striker

2024-05-27 62d9c195f4fa77af10b4ace59b4c3353a31f417a

 examples/mainwindow/mainwindow.h

@@ -30,6 +30,8 @@
protected:
    bool event(QEvent *event) override;

    void closeEvent(QCloseEvent *event) override;

private:
    void installWindowAgent();
    void loadStyleSheet(Theme theme);