LP#1281744 Aged hold purging column repair

Add missing non-NULLable "behind_desk" column to
action.all_hold_request, which is used during holds deletion and
archiving.

Signed-off-by: Bill Erickson <berick@esilibrary.com>
Signed-off-by: Dan Wells <dbw2@calvin.edu>
Stamping 0868 - 'behind_desk' fixes

Signed-off-by: Dan Wells <dbw2@calvin.edu>