There is no need to have an event filter to listen to changes to
_edit3dLocked and _edit3dHidden properties, as they are only changed
in one place. We can simply emit the change notification there.
Fixes: QDS-6403
Change-Id: I8136f38fd8e435e3a4dbd69d70169496e1675dfa
Reviewed-by: Mahmoud Badri <mahmoud.badri@qt.io>
Reviewed-by: Samuel Ghinet <samuel.ghinet@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>