bug#65049: Minor update to the repro steps

[Maxim Kim]

Eli Zaretskii <eliz@gnu.org> writes:

> Thanks, this finally allowed me to nail the sucker.  The fix is a bit
> more complex than I thought, because this bug has two parts: one of
> them in "C-x v D", the other in vc-git-checkin.  The patch is below;
> please give it a try with all your real-life use cases.

I have tried it for several repos I have -- all good!

Thank you, Eli!