fix compilation error for old qt versions

Zhao Yuhang

2025-02-09 bc03db3759e0d8644e626adcbda066ccb2c30062

 examples/mainwindow/light-style.qss

@@ -1,11 +1,13 @@
/* Window bar */

QWK--WindowBar[bar-active=true] {
    background-color: #195ABE;
    /*background-color: #195ABE;*/
    background-color: transparent;
}

QWK--WindowBar[bar-active=false] {
    background-color: #195ABE;
    /*background-color: #195ABE;*/
    background-color: transparent;
}


@@ -144,6 +146,10 @@
    background-color: #F3F3F3;
}

MainWindow[custom-style=true] {
    background-color: transparent;
}

QWidget#clock-widget {
    font-size: 75px;
    color: #333333;