mozc, mozc-ut: corrected the message for emacs.

;; Bad
(require 'mozc)
(set-language-environment "Japanese")
(setq default-input-method "japanese-mozc")

;; Good
(require 'mozc)
(setq default-input-method "japanese-mozc")
(set-language-environment "Japanese")

 If '(set-language-environment "Japanese")' comes earlier than
'(setq default-input-method "japanese-mozc")',
Emacs can't set japanese-mozc.
Therefore, Emacs can't connect Mozc server.

なんでやねん。