Speculative fix of title check in quick auto tests

Title might be changed after a successful page load too. The order is
not guaranteed. Implement wait for the expected title change.

Task-number: QTBUG-56180
Change-Id: If8c529e6246fe9e8c93e41be84c8934c8ed8d729
Reviewed-by: Kai Koehne <kai.koehne@qt.io>