Notification count is bumping up whenever unread notifications are shown

Steps to reproduce

1. Get a notification
2. Note the number on the notification counter
3. Display notification list
4. Note the number on the notification counter

What happens?

The notification counter is bumped up.

When notifications are mixed up (#2057 (closed)), it adds the total number of notifications in unread section to the notification count whenever the section is shown.

What is expected?

The notification counter should display the true number of notifications.

Context

I also had a single read notification, that might be also the case.

Funkwhale version(s) affected: develop