Change in organization of the definition of Formatter()

[jimmonte]

What is the issue with the Console Standard?

Item 3 of the definition of Formatter() at https://console.spec.whatwg.org/#formatter ("Let current be the second element of args.") should be moved into the sublist of item 6 since it is only required there. This change reduces the scope of the definition of current as well as improving its locality of reference.

[domfarolino]

Pull requests are welcome.