Correct update notifications
As reported downstream at:
https://bugzilla.redhat.com/show_bug.cgi?id=2009063
https://pagure.io/fedora-workstation/issue/107
There is still some flaw in the notification about new/pending updates.
- the suspend can delay the notification, depending whether the monotonic time moves on while the machine is suspended or not
- there had been reset the last update notification timestamp in error after the updates had been received.