Fix macOS title bar buttons not displaying properly.

Dylan Liu

2024-05-03 bdc57c6ec9b08f74ca65a06b8496fbaa3268c5fd

 examples/mainwindow/mainwindow.qrc

@@ -1,5 +1,6 @@
<RCC>
    <qresource prefix="/">
        <file>dark-style.qss</file>
        <file>light-style.qss</file>
    </qresource>
</RCC>