BUG-5537 FIX reverting breaking changes to pectorals and belly.

Fitted mesh introduced a couple of changes to the avatar_lad.xml file
that cause the avatar definition to change in ways that are not backwards-
compatible. Reverted the change in the range of pectoral size for male
avatars, and the change in the position of the belly morph position
(the later being a copy/paste error).