Use IS_AUTHENTICATED_FULLY instead of IS_AUTHENTICATED_REMEMBERED

In the case of an `anonymous: ~` firewall, if someone wishes to authenticate themselves and the remember_me feature hasn't kicked in yet, the behavior is pretty weird:

The user is not logged in but WHI asks him if he wants to connect his account. (Rather than simply logging the user is or sending the user to the connect_registration page). This behavior seems misguided and since the OAuthListener (position http) runs before the RememberMeListener (position remember_me), this most definitely looks like a bug to me...

Since I wasn't able to find any discussion on why REMEMBERED is used instead of (the usual) FULLY, I though it would be a nice way to start the discussion if one's needed.