Bug 21190: (follow-up) Save patron id in failure when available

Bug 21190: (follow-up) Save patron id in failure when available

The wrong password might belong to an existing user. If that is the case,
we have a $patron.
Note that logaction will save the object info but has no user in the
context environment for a failure.

Test plan:
Login with good user, bad pw and bad user, bad pw. Check logviewer.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Michal Denar <black23@gmail.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>