Bug 21192: Do not pick SelfRegistration hidden fields for SelfModification

Bug 21192: Do not pick SelfRegistration hidden fields for SelfModification

There was a mix up between "modification" and "edit" for $action in
opac-memberentry.pl.

If a patron is logged into the OPAC and they attempt to submit changes to their
personal details without having actually changed anything, the page reloads with
a message stating 'No changes were made.' However, the fields that now appear
are those that have been allowed/hidden according to the preferences set for
patron self registration, even if patron self registration is disabled. This can
lead to problems if there are discrepancies between the fields allowed for self
register settings and those allowed for patron self modification settings.

To replicate:

1.) In Administration › System preferences > OPAC, set PatronSelfRegistration to
'don't allow'

2.) Modify the unwanted fields for PatronSelfModificationBorrowerUnwantedField
and PatronSelfRegistrationBorrowerUnwantedField so that at least one field is
different between the two settings and save (for example, specify 'mobile' to be
hidden in the former, but don't include in the list of fields to be hidden in
the latter).

3.) Log into the OPAC and navigate to the 'your personal details' tab. Notice
that the editable fields correspond to those not hidden by
PatronSelfModificationBorrowerUnwantedField

4.) Without making any changes, click on 'Submit update request'.

5.) Note that on this page the fields correspond to those not hidden by
PatronSelfRegistrationBorrowerUnwantedField and are now editable (including any
fields that would otherwise be hidden by the Self Modification settings).

Reported-By: Chris Slone <cslone@camdencountylibrary.org>
Signed-off-by: Devinim <kohadevinim@devinim.com.tr>
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>