Bug 18532: (follow-up) Fix rebasing issue

Bug 18532: (follow-up) Fix rebasing issue

When the ILL notices were added, a bad rebase got rid of the notice
description in both messaging-preference-form.inc and opac-messaging.tt

This patch restores that line:

1. Set AutoRenewalNotices to 'according to patron...'
2. Edit a patron category
=> FAIL: There's an 'Unknown' label for 'Auto renewal'
3. Look at a patron's messaging preferences
=> FAIL: There's an 'Unknown' label for 'Auto renewal'
4. Look at a patron's messaging preferences in OPAC
=> FAIL: There's an 'Unknown' label for 'Auto renewal'
5. Apply this patch
6. Repeat 2, 3, 4
=> SUCCESS: 'Auto renewal' is displayed as expected

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>