Bug 29899: Show public note to patrons when placing a hold

Bug 29899: Show public note to patrons when placing a hold

This patch adds public note to the table of information shown about
items when placing a hold on a specific item in the OPAC.

To test, apply the patch and check Administration -> Circulation and
fine rules. You should have at least one patron category/item type
configured to allow OPAC item level holds.

- Modify an item to add information to the "Public note" field.
- Locate that record in the OPAC and place a hold on it.
- On the "Placing hold" page, click "Show more options" and "A specific
  item."
- In the table of items you should see a "Notes" column showing the
  information you added to the item.

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>