Exclude users from view_all_users

[mudmin]

The thing you'd have to change if you're in a list is that you'd have to pass in the user's id into the form itself. If it's just something that the admin is going to use, you could do input hidden with a name of userid and a value of the user's id. If that's something end users will see, you don't want to do that because they could use the chrome inspector to change the value of the hidden input.