Bug 24663: Handle special cases for recovery password and selfreg

Bug 24663: Handle special cases for recovery password and selfreg

The password recovery and self-registration features need to be
accessible at the OPAC even if not public.

Test plan:
Self register a new account, then ask for a new password with OpacPublic
turned off

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomás Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>