qt: disable using top-level window for tool tip on Wayland until Qt 6.9.2
The workaround for QTBUG-135158 was expected (!7094 (merged)) to land in Qt 6.9.1, but it got delayed and merged in Qt 6.9.2.
From https://codereview.qt-project.org/c/qt/qtdeclarative/+/648294:
Qt 6.9.1 content is already frozen & packages created so this needs to wait Qt 6.9.2. So please add something about this in Qt 6.9 known issues page: https://wiki.qt.io/Qt_6.9_Known_Issues
Request review @chub.