LP#1759382 Setting: staff placed holds default to workstation

LP#1759382 Setting: staff placed holds default to workstation

New org unit setting to always default the pickup location to
the workstation when placing holds as staff, regardless of the
patron's preferred pickup location.

The setting applies to staff placed holds in the Angular and
traditional catalogs.

Priority for determining the default pickup location when
placing holds as staff:

1. workstation if circ.staff_placed_holds_default_to_ws_ou
2. user preferred location if opac.default_pickup_location
3. workstation if circ.staff_placed_holds_fallback_to_ws_ou
4. user home org unit

Signed-off-by: Dan Briem <dbriem@wlsmail.org>