Bug 32426: Changes for opac-registration-verify

Bug 32426: Changes for opac-registration-verify

Similar to changes in opac-memberentry.

Test plan:
Now also enable  PatronSelfRegistrationVerifyByEmail.
Make the same change in Patron again with return $self.
Restart all. Self register. Check your email.
Follow the link. Verify that you have a similar alert.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>