Always use TLSv1.0 for record layer version in TLSv1.3

TLSv1.3 freezes the record layer version and ensures that it is always set
to TLSv1.0. Some implementations check this.

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2157)