Order value does not really make a difference because, unlike most other
groups, it is only used on PromotionStatus class which is a property
under Person (and is the only group there). I'm assuming reusing
status_group_specific for PromotionStatus items could also work for
similar reasons, and be more consistent with other classes.
Suggested-by: Stephan Heunis <s.heunis@fz-juelich.de>
This makes them appear when adding a PromotionStatus without having to
toggle "All fields" (order < 1M). Previously, editing PromotionStatus
opened without any field visible.