Let the user turn off locally a globalized minor mode

Let the user turn off locally a globalized minor mode
* emacs-lisp/easy-mmode.el (define-globalized-minor-mode):
Avoid re-enabling a minor mode after the user turned the minor mode
off if MODE-enable-in-buffers is run twice (typically once from
fundamental-mode's after-change-major-mode-hook and a second time from
run-mode-hook's own after-change-major-mode-hook).