Use the correct session resumption mechanism

Don't attempt to add a TLS1.3 session to a TLS1.2 ClientHello session
ticket extensions. Similarly don't add a TLS1.2 session to a TLS1.3
psk extension.

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2259)