Prepare to remove style support again

SineStriker

2023-12-22 a5d13e19dd7f6037e10b649c49805922ae5e0fa6

 examples/mainwindow/light-style.qss

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

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

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