fix [#34609] mesh.getVertex doesn't work as spected with poly.getMaterialIndex() and poly vertex indexes
revert r22906 (own old commit, was incorrectly trying to make vertex indices absolute)


git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@56460 954f8c5b-7b00-dc11-b283-0030488c597c