Fix bug in org-narrow-to-subtree, which could lead to clock errors

Fix bug in org-narrow-to-subtree, which could lead to clock errors

Bernt Hansen writes:

> I have a monthly repeated task (Archive tasks) that has lots of
> old clock time on it currently but has never been marked DONE
> since the creation of the property LAST_REPEAT_TIME.  If this
> task is clocking when Emacs exits and you restart emacs and
> answer Yes to continue the clock - the modeline has the total
> time for the parent task (151:04 instead of the total time for
> this task (5:04).  If I clock the task in again the modeline is
> correct.