Don't return archived users in user photo tags

[wilco375]

Currently, all users are shown when searching for tags. However, archived users should not be visible in this list. This can also be implemented client-side but it's probably nicer to do server side, maybe even block the creation of tags for archived users, since all tags are deleted on archival of a user.

[wilco375]

Should be (largely) fixed if #428 is fixed, since there should only be one archived user then. Have to validate whether this user is still shown in the list or not.