Angular Staff Catalog: Place Hold screen doesn't allow override when no copies

[Terran McCanna]

In 3.8-beta-ish master:

The Angular staff catalog place hold screen doesn't appear to acknowledge when a staff user has the PLACE_UNFILLABLE_HOLD permission.

To recreate the problem in Concerto:
- Select a record and mark all of the copies on a record Missing (or delete them, or place them in some other unholdable status).
- Give the PLACE_UNFILLABLE_HOLD permission to a staff user.
- Log in as the staff user and try to place a hold on that record.
- The Place Hold button appears, but the override option does not.

Also noting that I *do* get the override option when logged in as the admin account, but not a staff account with the added permission. I also added the ITEM_NOT_HOLDABLE.override permission to the staff account and it still didn't work. (Is there another permission it's looking at that I'm missing?)

Noting that I also tried installing this patch, which *did* solve the problem in the Traditional staff catalog, but not in the Angular staff catalog: https://bugs.launchpad.net/evergreen/+bug/1906842