fb_user.module: Post user hook should pass the info variable

So there's a situation where I needed to use the info variable AFTER the user account was created for some extra code to mess with the user account, but the variable was only available during the pre_user hook, before the account was created.

I have manually patched it in on my side, but thought others might need or want to do the same, so here is a patch. (I'm not sure on guidelines for how patch should be formatted like, it's what I got out of my tortoise git)