[SeeRM 8836] Change boot.ini to win.ini

This is for the following redmine issue:
https://dev.metasploit.com/redmine/issues/8836

Notice I'm using backslashes instead of forward slashes. Newer Windows boxes are okay with both, but older ones only allow backslashes.

## To verify ##

- [ ] Make sure all changes point to C:\Windows\win.ini
- [ ] Try to recreate as many setups as possible for testing until either they're all covered, or you feel is enough.