fix compilation error

Zhao Yuhang

2025-02-04 cc65c4da6ad762e8648b2ab6a801e07c50922d3d

 examples/mainwindow/mainwindow.h

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

    void closeEvent(QCloseEvent *event) override;

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