keys: Don't bind illegal C-TAB

* lisp/org-keys.el (org-mode-map): Bind `org-force-cycle-archived' to
C-c C-<tab> instead of C-c C-TAB.

Reported-by: Ingo Lohmar <ingo.lohmar@posteo.net>
<http://lists.gnu.org/r/emacs-orgmode/2021-10/msg00048.html>

lisp/org-keys.el

@@ -444,7 +444,7 @@ COMMANDS is a list of alternating OLDDEF NEWDEF command names."
 
 ;;;; TAB key with modifiers
 (org-defkey org-mode-map (kbd "TAB") #'org-cycle)
-(org-defkey org-mode-map (kbd "C-c C-TAB") #'org-force-cycle-archived)
+(org-defkey org-mode-map (kbd "C-c C-<tab>") #'org-force-cycle-archived)
 ;; Override text-mode binding to expose `complete-symbol' for
 ;; pcomplete functionality.
 (org-defkey org-mode-map (kbd "M-TAB") nil)