TPAC - edit hold defines bad pickup locations

Evergreen master

When a patron goes to edit a hold in TPAC, they have the option to choose a different pickup location. Unfortunately, it looks like that dropdown does not prevent them from selecting locations that aren't normally allowed for pickups, such as system groups or consortium itself.

Probably need to find the logic used in other parts of TPAC that define holdable pickup locations and change this.

Credit to Melissa Lefebvre for finally nailing down the source of the issue.