Use brilliant workaround to show Windows 10 top border

Sine Striker

2023-12-24 46285db399f75154ad6c451e12f2cae2e59ace25

 src/core/windowagentbase.h

@@ -24,7 +24,6 @@
            Minimize,
            Maximize,
            Close,
            NumSystemButton,
        };
        Q_ENUM(SystemButton)