Fix typo in bad encoding definition

[notetiene]

The coding definition is a local variable definition[1]. However, this uppercase UTF-8, makes MULE (Emacs) prevent saving this file.

[1] https://www.gnu.org/software/emacs/manual/html_node/emacs/Specifying-File-Variables.html).

[Stunkymonkey]

did not know about that. thanks for your contribution