Updated download URL regex pattern.

* Fixed re_pattern to match some slight changes to the download URL
* Added re_flags with IGNORECASE to further cover bases in re_pattern
Removed unattended_install key from pkginfo

* It just now occurred to me that this was a bad idea in that
  the driver could change on a user in the background possibly
  causing some kind of runtime error. It's not necessary to do
  that, I just was not thinking it through when I originally
  wrote this recipe.