Also fixes updating the visited links manager when off-the-record
changes or a storage path is set or changed.

Change-Id: Iffa90edde35f2d84146f3ab3b3861ef113e321f3
Reviewed-by: Robin Burchell <robin.burchell@viroteck.net>
Reviewed-by: Michael Brüning <michael.bruning@theqtcompany.com>