org-choose.el: Append new interpretation for custom widget

org-choose.el did prepend its new interpretation to the list of
possible interpretations.  Now it appends, as it should.

contrib/lisp/org-choose.el

@@ -468,7 +468,8 @@ NEW-MARK and OLD-MARK are the text of the new and old marks."
      (add-to-list 'org-trigger-hook
 		  #'org-choose-keep-sensible)
      (add-to-list 'org-todo-interpretation-widgets
-		  '(:tag "Choose   (to record decisions)" choose))
+		  '(:tag "Choose   (to record decisions)" choose)
+		  'append)
 ; CD      (add-to-list 'org-todo-normal-interpretations 'choose))
    ))