Avoid fleshing standing penalty org unit children

Avoid fleshing standing penalty org unit children

When fleshing the org unit on standing penalties, exclude child org
units. We don't need them, and they can cause issues when your
standing penalty has a Depth of "Everywhere": you end up with a full
copy of the org unit tree, and you will include this when editing
and saving the user.

Signed-off-by: Jeff Godin <jgodin@tadl.org>