Bug 20450: Add collection to item table when placing a hold on a specific copy (OPAC)

Bug 20450: Add collection to item table when placing a hold on a specific copy (OPAC)

This patch adds a new collection column to the item table when selecting
a specific item for a hold. The column will only appear if at least
one item has a collection set.

To test, in OPAC:
- Place a specific hold on
  - a record with one or more items with collections
  - a record with one or more items without collections
- Verify the collections display correctly when they exist
- Verify the table still works as expected

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>