Bug 31387: Fix othernames required label

Bug 31387: Fix othernames required label

1. Mark othernames as required via PatronSelfRegistrationBorrowerMandatoryField
2. Go to the self-reg form, the field is required but the span that makes it look required stays hidden. (<div class="required_label required">Required</div>)
3. Mark initials as required via PatronSelfRegistrationBorrowerMandatoryField.
4. Now the label_required field appears for othernames in the self ref form
5. Apply patch
6. Try again, the label should now properly show when othernames is marked as required

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>