Add non-system-border option on Windows

Sine Striker

2023-12-22 c837319767bb609c6ec806336e49a347c77b11d3

 src/quick/quickwindowagent.cpp

@@ -32,9 +32,7 @@
            return false;
        }

        if (!d->setup(window, new QuickItemDelegate())) {
            return false;
        }
        d->setup(window, new QuickItemDelegate());
        d->hostWindow = window;

#ifdef Q_OS_WINDOWS