[ticket/12815] Show memberlist link for guests (if permitted)

PHPBB3-12815
[ticket/12815] Remove S_REGISTERED_USER for team link

PHPBB3-12815
Merge remote-tracking branch 'PayBas/ticket/12815' into develop-ascraeus

* PayBas/ticket/12815:
  [ticket/12815] Remove S_REGISTERED_USER for team link
  [ticket/12815] Show memberlist link for guests (if permitted)