Bug 23485: Show barcode in holds to pull

Bug 23485: Show barcode in holds to pull

Updated to only show one barcode number, with either an "only" or an "or any available" depending on whether it's an item or bib hold.
Also incorporating feedback to simplify the TT logic and remove list formatting.

To test:
1 - Place an item level hold on a bib with several items with the same callnumber
2 - View the holds to pull report
3 - Try to guess which one on the shelf is right?
4 - Apply patch
5 - See the barcode in holds to pull report
6 - You can now grab the correct item (but don't yet)
7 - Place a next available hold on the same title
8 - See the report now shows one possible valid barcode with the text "or any available."
9 - Check in a different item that fills the next available hold
10 - Now the report shows the single item for the borrower

Signed-off-by: Michal Denar <black23@gmail.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>