Postfix to the previous patch, changing after-change-functions for demotion

* lisp/org.el (org-promote):
(org-demote): Soften the previous change, by only removing the
flyspell function from after-change functions, because that was the
one causing the slowdown - at least much of it.

lisp/org.el

@@ -7145,7 +7145,8 @@ If the region is active in `transient-mark-mode', promote all headings
 in the region."
   (org-back-to-heading t)
   (let* ((level (save-match-data (funcall outline-level)))
-	 (after-change-functions)
+	 (after-change-functions (remove 'flyspell-after-change-function
+					  after-change-functions))
 	 (up-head (concat (make-string (org-get-valid-level level -1) ?*) " "))
 	 (diff (abs (- level (length up-head) -1))))
     (if (= level 1) (error "Cannot promote to level 0. UNDO to recover if necessary"))
@@ -7161,7 +7162,8 @@ If the region is active in `transient-mark-mode', demote all headings
 in the region."
   (org-back-to-heading t)
   (let* ((level (save-match-data (funcall outline-level)))
-	 (after-change-functions)
+	 (after-change-functions (remove 'flyspell-after-change-function
+					  after-change-functions))
 	 (down-head (concat (make-string (org-get-valid-level level 1) ?*) " "))
 	 (diff (abs (- level (length down-head) -1))))
     (replace-match down-head nil t)