Fix WindowsRegistryKey for Qt 6.8.1 (#154)

Daniel

2024-12-06 91274c58b1772dfe38d3fcab291693141e822684

 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);