Modified the default value used in the vertex widen rule so that it is specified as a template argument.

TRAC #22703

Signed-off-by: Jamie Madill
Signed-off-by: Shannon Woods
Author: Geoff Lang

git-svn-id: https://angleproject.googlecode.com/svn/branches/es3proto@2090 736b8ea6-26fd-11df-bfd4-992fa37f6226