Bug 36560: Add a CSRF exception for ILS-DI API

Bug 36560: Add a CSRF exception for ILS-DI API

This change adds an exception for the ILS-DI API for CSRF prevention since there is no way to acquire a CSRF token
for the ILS-DI API.

1. Go to http://localhost:8081/cgi-bin/koha/admin/preferences.pl?op=search&searchfield=ILS-DI
2. Enable "ILS-DI"
3. curl -v localhost:8080/cgi-bin/koha/ilsdi.pl -d "service=AuthenticatePatron&username=REALUSER&password=REALPASSWORD"
4. Note the 403 response

5. Apply the patch
6. sudo koha-plack --restart kohadev

7. curl -v localhost:8080/cgi-bin/koha/ilsdi.pl -d "service=AuthenticatePatron&username=REALUSER&password=REALPASSWORD"
8. Note the 200 response

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>