use new in Qt6.8 windows fluent style

Signed-off-by: Matthieu Gallien <[email protected]>

Author: mgallien

src/gui/main.cpp

@@ -79,7 +79,7 @@ int main(int argc, char **argv)
 #if defined Q_OS_MAC
     style = QStringLiteral("macOS");
 #elif defined Q_OS_WIN
-    style = QStringLiteral("Fusion");
+    style = QStringLiteral("FluentWinUI3");
 #endif
 
     QQuickStyle::setStyle(style);