LP1837656 Org proximity admin disable org filter

LP1837656 Org proximity admin disable org filter

Disable the org unit filter for the auto-generated org unit proximity
adjustment admin page so that it does not automatically filter the grid by
any of the org unit fields.

Modify the IDL to indicate that the 'pos' field on the org unit
proximity adjustement class is required.

To test:

1. Navigate to
   /eg2/en-US/staff/admin/server/actor/org_unit_proximity_adjustment
2. Create an adjustment if non exist.
3. Confirm the 'Position' field is now required.
4. Confirm new adjusment row appears in the grid after it's created.

Signed-off-by: Bill Erickson <berickxx@gmail.com>