Fix up previous mh-speed.el ignored variable change

* lisp/mh-e/mh-speed.el (mh-speed-toggle, mh-speed-view): Mark the
ignored parameter with _ instead of using the Common Lispish
(declare (ignore args)) (which Emacs Lisp doesn't really support),
except by accident.

lisp/mh-e/mh-speed.el

@@ -125,10 +125,9 @@ With non-nil FORCE, the update is always carried out."
         ;; Otherwise on to your regular programming
         (t t)))
 
-(defun mh-speed-toggle (&rest ignored)
+(defun mh-speed-toggle (&rest _ignored)
   "Toggle the display of child folders in the speedbar.
 The optional arguments from speedbar are IGNORED."
-  (declare (ignore args))
   (interactive)
   (beginning-of-line)
   (let ((parent (get-text-property (point) 'mh-folder))
@@ -164,10 +163,9 @@ The optional arguments from speedbar are IGNORED."
               (mh-line-beginning-position) (1+ (line-beginning-position))
               '(mh-expanded t)))))))
 
-(defun mh-speed-view (&rest ignored)
+(defun mh-speed-view (&rest _ignored)
   "Visits the selected folder just as if you had used \\<mh-folder-mode-map>\\[mh-visit-folder].
 The optional arguments from speedbar are IGNORED."
-  (declare (ignore args))
   (interactive)
   (let* ((folder (get-text-property (mh-line-beginning-position) 'mh-folder))
          (range (and (stringp folder)