Bug 14403: Remove warn in Koha::NorwegianPatronDB

Bug 14403: Remove warn in Koha::NorwegianPatronDB

Line 99 has an unconditional warn, left over from development:

warn "$combined_username => $combined_password";

This patch deletes the line i question.

To test:
No testing needed, just have a look at the diff and see that
it makes sense to delete the warn.

Signed-off-by: Indranil Das Gupta (L2C2 Technologies) <indradg@gmail.com>
Signed-off-by: Jonathan Druart <jonathan.druart@koha-community.org>
Signed-off-by: Tomas Cohen Arazi <tomascohen@unc.edu.ar>