Bug 27050: Allow multiple category_codes in delete_patrons.pl

Bug 27050: Allow multiple category_codes in delete_patrons.pl

This patch allows multiple --category_code <categorycode> in delete_patrons.pl

The t/db_dependent/Members.t test has 2 added testcases with multiple category_code.

To test:
1) Run the test: prove -l . -v t/db_dependent/Members.t
2) This requires records in the database with at least two category codes. For example PT and ST.
3) Run the script: delete_patrons.pl --category_code PT
4) Confirm the number of patrons that would have been deleted.
5) Run the script: delete_patrons.pl --category_code PT --category-code ST
6) Confirm the number of patrons that would have been deleted.
7) Sign Off

Sponsored-by: Lunds Universitetsbibliotek
Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>