define-minor-mode: sanitize mode function messages

* emacs-lisp/easy-mmode.el (define-minor-mode): Ensure mode's
pretty name is not interprted as a message formatting string,
e.g., if the mode name contains a '%'.  (Bug#63343)

lisp/emacs-lisp/easy-mmode.el

@@ -390,7 +390,7 @@ or call the function `%s'."))))
                                  (not (equal ,last-message
                                              (current-message))))
                       (let ((local ,(if globalp "" " in current buffer")))
-			(message ,(format "%s %%sabled%%s" pretty-name)
+			(message "%s %sabled%s" ,pretty-name
 			         (if ,getter "en" "dis") local)))))
 	      ,@(when after-hook `(,after-hook)))
 	    (force-mode-line-update)