Bug 23150: (follow-up) Make gdpr_proc_consent mandatory for create

Bug 23150: (follow-up) Make gdpr_proc_consent mandatory for create

When updating (patron modification), the field should not be required.

Test plan:
Check patron modification on opac.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
(cherry picked from commit 6dc8306b58bc1207f396d2df919a3daf4712e8e5)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
(cherry picked from commit b6b773c39a52ee92c96e2d10ceed323f55e8b885)

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>