[Orgmode] Small bug in timestamp editing

[Jason F. McBrayer]

There's a bug in editing inactive timestamps when they are a part of a
CLOCK line (org 4.75 on cvs emacs).

E.g.:
* test
  CLOCK: [2007-05-30 Wed 13:30]--[2007-05-30 Wed 13:32] =>  0:02

Try editing the /second/ timestamp with org-shiftup or similar.  It
will result in:

* test
  CLOCK: [2007-05-30 Wed 13:30]--[2007-05-30 Wed]  0:02 => -14:30

This does not appear to happen with timestamps in other contexts.

-- 
+-----------------------------------------------------------+
| Jason F. McBrayer                    address@hidden  |
| If someone conquers a thousand times a thousand others in |
| battle, and someone else conquers himself, the latter one |
| is the greatest of all conquerors.  --- The Dhammapada    |