Treat PHP 404's the same as other 404's.

For some strange reason, LiquidWeb has configured Nginx to treat these types of 404 differently. That means that if someone goes to your LW WordPress hosted site and requests 'doesnotexist.php' the error message is a plain boring 404 page with "file not found" but if someone requests 'doesnotexist' it shows the theme's custom 404 page that looks nice.