update win11 picture

Yuhang Zhao

2023-12-19 88b91b1fec752538beebca2fd92e62c8e03f32d4

 examples/mainwindow/dark-style.qss

@@ -16,6 +16,7 @@
    border: none;
    color: #ECECEC;
    background-color: transparent;
    min-height: 28px;
}