review-tui: show no-reply preview for note-only reviews

If a note is attached and nothing else is placed in the review then the
email screen says:

   No email to preview (missing message-id?).

Which sounds like an error, really there is no message to send so it
should say:

   No reply will be sent for this patch.

Remove note from the condition.

Assisted-by: LLM
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://patch.msgid.link/0-v1-0c2c3c276e04+ce2-note_email_jgg@nvidia.com
Signed-off-by: Konstantin Ryabitsev <konstantin@linuxfoundation.org>