ob: ob-demarcate updated to reflect the new info list contents

* lisp/ob.el (org-babel-demarcate-block): updated to reflect the new
  info list contents

lisp/ob.el

@@ -1185,7 +1185,7 @@ region is not active then the point is demarcated."
            (save-excursion
              (goto-char place)
              (let ((lang (nth 0 info))
-                   (indent (make-string (nth 6 info) ? )))
+                   (indent (make-string (nth 5 info) ? )))
 	       (when (string-match "^[[:space:]]*$"
 				   (buffer-substring (point-at-bol)
 						     (point-at-eol)))