Fix typo

Zhao Yuhang

2024-05-27 a9c357c40d29e9a7ea59ffa80214657ef58c7dbe

 examples/mainwindow/mainwindow.cpp

@@ -60,8 +60,7 @@
    setWindowTitle(tr("Example MainWindow"));
    resize(800, 600);

    setFixedHeight(600);

    // setFixedHeight(600);
    // windowAgent->centralize();
}