internal/util: move the case 'latin1'

make the `case 'latin1':` near by `case 'binary':`.

PR-URL: https://github.com/nodejs/node/pull/9646


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Roman Reiss <me@silverwind.io>
Reviewed-By: Michaël Zasso <targos@protonmail.com>