bug#10822: 23.4; `l' in vc-dir with hg backend moves to the first commit

[Chong Yidong]

Leo <sdl.web@gmail.com> writes:

> In a vc-dir buffer with hg backend, hitting `l' (vc-print-log) point is
> moved to the first commit in *vc-change-log* buffer. This seems
> inconsistent with other backends where point is moved to the newest
> commit. I wonder if this is a bug?
>
> Software: Mercurial Distributed SCM (version 2.1)

We might as well make it consistent.  Patch welcome.