Bug 30730: Holds to Pull should not list items with a notforloan status

Bug 30730: Holds to Pull should not list items with a notforloan status

Remove items with a notforloan value other than 0 because items that are
potentially holdable (with negative notforloan status) are not wanted in holds to pull.

Test plan:
1- Have a bib with 2 items, both holdable. Give one of these items a notforloan status with a negative value (like Ordered in the testing docker data).
2- Place a title-level hold on your bib
3- Confirm your bib is showing on Holds to Pull as expected, prompting staff to pull the item that does not have a not for loan status (correct!)
4- Take the item that does not have a not for loan status and check it out to a different patron, make sure not to fill or cancel your hold
5- Reload Holds to Pull, see your title is still listed and now Koha is directing staff to the item with a notforloan status
6- Apply the patch
7- Reload Holds to Pull, see your title with a notforloan status is gone
8- Run `prove t/db_dependent/Koha/Holds.t` and all tests should pass

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>