Bug 29930: Cardnumber incorrectly set to userid on LDAP auth if cardnumber not mapped

Bug 29930: Cardnumber incorrectly set to userid on LDAP auth if cardnumber not mapped

In the sub the userId was given, but the cardnumber was expected, therefore at every login the cardnumber changed to the userId.

To test:
1. Login to the OPAC with an LDAP account that has a cardnumber which is different to the userId
2. Check the patron record's cardnumber.
3. The cardnumber should equal to the userId
4. Apply the patch.
5. Login to the OPAC with an LDAP account that has a cardnumber which is different to the userId
6. Check the patron record's cardnumber.
7. The cardnumber should be the same as before

Signed-off-by: Alexander Wagner <alexander.wagner@desy.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Extra test plan:
1. Apply the regression tests
2. Run:
   $ ktd --shell
  k$ prove t/db_dependent/Auth_with_ldap.t
=> FAIL: Tests fail! 'cardnumber' incorrectly overwritten
3. Apply this patch
4. Repeat 2
=> SUCCESS: Tests now pass!
5. Sign off :-D

Signed-off-by: Alexander Wagner <alexander.wagner@desy.de>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>