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>

opac/opac-memberentry.pl

@@ -366,6 +366,7 @@ sub GetMandatoryFields {
       C4::Context->preference("PatronSelfRegistrationBorrowerMandatoryField");
 
     my @fields = split( /\|/, $BorrowerMandatoryField );
+    push @fields, 'gdpr_proc_consent' if C4::Context->preference('GDPR_Policy') && $action eq 'create';
 
     foreach (@fields) {
         $mandatory_fields{$_} = 1;