Update Aauth.php

When trying to login a user with a special password for example: Password@123, the script would return an error saying the password was wrong.

I removed "or !ctype_alnum($pass)" from the login section which allows users to login and register with html chars in their passwords.
Merge pull request #14 from peazz/patch-1

 !ctype_alnum($pass) is removed so now special chars (@ ! ?) can be used for password