Cleanup hardcoded cipher suite codepoints in s_server

Cleanup hardcoded cipher suite codepoints in s_server

The hardcoded code points for TLSv1.3 cipher suites are used in the TLS
PSK server callback. However, they seem to have been refactored a while
ago to use tls13_aes128gcmsha256_id, so these defines are not necessary
within the s_server code anymore.

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/10243)

(cherry picked from commit aed8c47cbcc8a289bea433ead2effea035187260)