Bug 24114: Remove warn statements from Koha::Patrons

Bug 24114: Remove warn statements from Koha::Patrons

The warn must be done in the cronjob.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Followed this test plan (with two follow-ups applied):
[1] Prefs: UnsubscribeReflectionDelay=1, PatronAnonymizeDelay=2, PatronRemovalDelay=3, FailedLoginAttempts was undef
[2] Pick borrower and set expiry to NOW-2, and lock him (login_attempts=-1) Could be achieved too by settings FailedLoginAttempts and trying wrong passwords. Run cleanup job:
    Locked 0 patrons
    Anonymized 1 patrons
    Deleted 0 patrons
[3] Pick borrower, set expiry to NOW-3. Run cleanup job:
    Locked 0 patrons
    Anonymized 0 patrons
    Deleted 1 patrons

Signed-off-by: Bouzid Fergani <bouzid.fergani@inlibro.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>