Sending User group to Trash sends User to Trash.

Steps:

1. Create new user group.
2. Create new user in that group.
3. Try sending that user group to Trash.
4. Confirm on the delete warning dialog.
5. Check the Trash.

Actual result: Both the user group and the user are in the Trash.
Expected result: User is deleted, like when deleting directly from user level.