Disable kwayland-integration for kf6-qt6
This is a bit of an odd case
master is still building with Qt5 for integration with Qt5 apps, but it's not needed for Qt6 apps, so no Qt6 build
This is a bit of an odd case
master is still building with Qt5 for integration with Qt5 apps, but it's not needed for Qt6 apps, so no Qt6 build