org-clone-subtree-with-time-shift: Fix timestamp search
* lisp/org.el (org-clone-subtree-with-time-shift): Move to the
beginning of the heading before the timestamp search so that the
user will be prompted for a time shift even if point is after the
timestamp.
This also prevents an "Invalid search bound" error if point is on the
blank line following a body-less heading:
* single line <2017-02-28 Wed>
<point here>
Reported-by: Karl Voit <devnull@Karl-Voit.at>
<http://permalink.gmane.org/gmane.emacs.orgmode/111456>