Bug 19840: Fix - display patron note on checkin

Bug 19840: Fix - display patron note on checkin

If a patron let a note on the checkout (AllowCheckoutNotes), it is
supposed to be displayed when checked in.

Test plan:
1/ Enable AllowCheckoutNotes
2/ Check an item out
3/ At the opac let a note on the checkout
4/ Check the item in
   => With this patch applied you should see the notes displayed

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>