send-email: remove warning about unset chainreplyto
Three years and a half is probably more than enough time to give users
the opportunity to configure Git to do what they want. If they haven't
changed the configuration by now, this warning message is not going to
do anything for them anyway.
This effectively reverts commit
528fb08 (prepare send-email for smoother
change of --chain-reply-to default).
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>