Minor patch to repair non-working module

Looks like this module isn't maintained anymore, but I needed similar functionality for a current project.
This module didn't work at all for me with d6.x + webform 3.x + content profile 1.0

I made some changes with the way that form_state values are handled in webform_register_validate() and _webform_submit_webform_register() and it seems to be working now for me.

Also addresses #1031908: Constant validation error