[notifications] Changing the role shows notification "added to space"

### Steps to reproduce
1. Create a space
2. Add another member as "space admin"
3. change own role to "editor"

### Expected behaviour
No notification gets shown
OR
Notification "{username} changed your role to "editor" gets shown

### Actual behaviour
Notification "{username} added you to space {spacename}" gets shown


### Environment general
https://ocis.ocis-wopi.latest.owncloud.works