Bug 30987: Fix relationship fields for patron full and quick add forms

Bug 30987: Fix relationship fields for patron full and quick add forms

To test:
1. APPLY PATACH and restart services.
2. Find the borrowerRelationship system preference. The description should no longer include the words "Leave empty to deactivate."
3. Populate the system preference with at least 1 choice.
4. Find a patron category with can_be_guarantee set to 'Yes'.
5. Quick add a patron of that type, making sure the relationship field shows in the Patron guarantor section. ( You have to +Add gaurantor before this field will show )
6. The values in the dropdown should refelct the borrowerRelationship values.
7. With BorrowerMandatoryField make relationship mandatory.
8. Try step 5 again, this time the Relationship field should be mandatory.
9. Remove the field from  BorrowerMandatoryField and add it to BorrowerUnwantedField.
10. Do step 5 again, the relationship field should not show on the quick add form.

Signed-off-by: Myka Kennedy Stephens <mkstephens@fosgail.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
(cherry picked from commit fccbd327d9f93925917e7a4f478ab72c1d1f2363)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>