Bug 31447: Use holds pick up branch in "Please confirm checkout" message

Bug 31447: Use holds pick up branch in "Please confirm checkout" message

When one tries to check out item which has hold in it,
"Please confirm checkout" message uses patrons home library
instead of holds pick up library. It would be more logical
to use latter here.

To test:
1. Find record with holds.
2. For first priority hold, change it's pick up library to differ from patrons homebranch if needed.
3. Check out records item for a different patron.
=> Note that notice reads: "Item ... has been on hold for ... at [patrons homebranch] since ...".
4. Apply this patch.
5. Repeat steps 2 and 3.
=> Notice should now read: "Item ... has been on hold for ... at [holds pick up branch] since ...".

Sponsored-by: Koha-Suomi Oy
Signed-off-by: Axelle Clarisse <axelle.clarisse@univ-amu.fr>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>