Remove old style NewSessionTicket from TLSv1.3

TLSv1.3 has a NewSessionTicket message, but it is *completely* different to
the TLSv1.2 one and may as well have been called something else. This commit
removes the old style NewSessionTicket from TLSv1.3. We will have to add the
new style one back in later.

Reviewed-by: Rich Salz <rsalz@openssl.org>