Bug 10570: Show nonpublic note on check expiration page

Bug 10570: Show nonpublic note on check expiration page

The check expiration page in serials only showed the OPAC note,
but it makes sense to also show the nonpublic note here.

This patch adds it.

To test:
- Add a subscription, make sure to enter different notes in
  nonpublic note and OPAC note to check for display later on.
- Go to the check expiration page and search for your subscription.
- Check both notes show up correctly.

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>