Notifications from the same source don't get replaced

[lduboeuf]

reference ticket: https://gitlab.com/ubports/development/core/lomiri-notifications/-/issues/

Step to reproduce: having several notifications from the same app, the list is growing whereas previous behavior was only one entry per app

[trism]

The linked issue is against a notification daemon, forked from somewhere that isn't here. This is an indicator that just collects recent notifications.

[lduboeuf]

ah, i see sorry