Fix mapcar call from 9df82be07

* lisp/org.el (org-tags-expand): Add missing mapcar argument.

lisp/org.el

@@ -14130,7 +14130,7 @@ When DOWNCASED is non-nil, expand downcased TAGS."
   (let ((tag-groups
 	 (let ((g (or org-tag-groups-alist-for-agenda org-tag-groups-alist)))
 	   (if (not downcased) g
-	     (mapcar (lambda (s) (mapcar #'downcase s)))))))
+	     (mapcar (lambda (s) (mapcar #'downcase s)) g)))))
     (cond
      (single-as-list (org--tags-expand-group (list match) tag-groups nil))
      (org-group-tags