Bugfix: Mac multiple dialogs block all input

We back ported a fix to a Qt bug which causes multiple dialogs on Mac to block all input.


https://github.com/owncloud/client/issues/8421
https://bugreports.qt.io/browse/QTBUG-91059
https://invent.kde.org/packaging/craft-blueprints-kde/-/commit/feca22a30f8d3a2122fd9b2097351fcb2da28543
