Fix the s_server psk_server_cb for use in DTLS
Fix the s_server psk_server_cb for use in DTLS

Commit 0007ff257c added a protocol version check to psk_server_cb but
failed to take account of DTLS causing DTLS based psk connections to
fail.

Fixes #16707

Reviewed-by: Ben Kaduk <b34e9dc3dd24827b45bb22e8b76cde1bcb413b0e@mit.edu>
(Merged from https://github.com/openssl/openssl/pull/16838)

openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl