Bug 13526 - Mandatory fields should not be able to be hidden in borrower self-registr...

Bug 13526 - Mandatory fields should not be able to be hidden in borrower self-registration

Currently, mandatory fields in the borrower self-registration can be hidden.
This causes problems since the validator rejects the registration,
even though all required fields on the screen have been filled out.

This is especially a problem when using the system preference
"PatronSelfRegistrationVerifyByEmail", since it automatically makes
"email" a mandatory field.

This patch makes it so that a mandatory field cannot be hidden on
the self-registration page.

_TEST PLAN_

Before applying
1) Hide the "email" and the "emailpro" fields using the
"PatronSelfRegistrationBorrowerUnwantedField" system preference.

2) Make the "email" and the "emailpro" fields mandatory using the
"PatronSelfRegistrationBorrowerMandatoryField" system preference.

3) Note that you cannot see "Primary email" or "Secondary email"
on the self registration page.
(The registration page which can be found by turning
on "PatronSelfRegistration" and filling in
"PatronSelfRegistrationDefaultCategory". The link will be on
opac-main.pl on the right side of the screen under the login box.)

4) Note that you cannot submit a self-registration request as
the system tells you that you have not filled in all the mandatory
fields.

5) Apply the patch && refresh the self registration page

6) Note that you can now see "Primary email" and "Secondary email"
on the self-registration screen".

Signed-off-by: Abby <abbyrobnz@gmail.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>
(cherry picked from commit fd6176d0a58e5e5016d5db002578b7a7dee9531c)
Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>