Bug 18915: Renaming svc/patron_notes to svc/checkout_notes

Bug 18915: Renaming svc/patron_notes to svc/checkout_notes

For consistency.

Signed-off-by: Marjorie Barry-Vila <marjorie.barry-vila@collecto.ca>
https://bugs.koha-community.org/show_bug.cgi?id=19801

Signed-off-by: Marjorie Vila <marjorie.barry-vila@collecto.ca>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
(cherry picked from commit 065d3de88c55d8ce9efd05ecf80b073fffef242a)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>