same problem as fdo#78151, except that pre-existing documents created
before the bullet/numbering toggling UI change have PRESOBJ_OUTLINEs with
paras in them with "numbering off" but the outline level they are a
preview of still have numbering enabled.

Leave the actual numbering styles alone in this case and toggle the
PRESOBJ_OUTLINEs paras back to the level they "really" are

Change-Id: I76508f88b5003afd1740feee3ec328326117f896