Bug 23816: (follow-up) Fix many things

Bug 23816: (follow-up) Fix many things

This patch:
 * reverts changes on misc/admin/set_password.pl
 * makes category param mandatory for AuthUtils::is_valid_password and AuthUtils::generate_password
 * changes onboarding.pl to set category param in AuthUtils::is_valid_password
 * Completes t/db_dependent/AuthUtils.t and drops t/AuthUtils.t
 * Removes offending <input type="number"/> and replaces it by <input type="text" inputmode="numeric" pattern="[0-9]*"/>

https://bugs.koha-community.org/show_bug.cgi?id=23826

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>