Bug 30213: Hide Delete (aka Priority) column when user only has place_hold permission

Bug 30213: Hide Delete (aka Priority) column when user only has place_hold permission

This patch changes the way the priority column displays when viewing a
list of holds as a user who doesn't have permission to change hold
priority.

To test:

- Apply the patch and log into the staff interface as a user with
  at least "place_hold" permission.
- Locate a record which can be put on hold and place multiple holds.
- View the list of holds.
- As a user with both "place_hold" and "modify_holds_priority"
  permission, you should see a "Priority" column with <select> fields
  allowing you to change hold priority. You should also see the arrow
  buttons for changing priority.
- As a user with only "place_hold" permission, the "Priority" column
  should show the priority as a number. You should not see the arrow
  buttons.
- In both cases, confirm that all operations work correctly: Changing
  hold date, expiration date, pickup library, suspended status;
  Cancelling holds.

Signed-off-by: Christopher Brannon <cbrannon@cdalibrary.org>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>