Revert "TLS 1.3: SRV: Don't select ephemeral mode on resumption"

This reverts commit dadeb20383.

Signed-off-by: Pengyu Lv <pengyu.lv@arm.com>

library/ssl_tls13_server.c

@@ -1026,8 +1026,7 @@ MBEDTLS_CHECK_RETURN_CRITICAL
 static int ssl_tls13_check_ephemeral_key_exchange(mbedtls_ssl_context *ssl)
 {
 #if defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL_ENABLED)
-    return !ssl->handshake->resume &&
-           mbedtls_ssl_conf_tls13_ephemeral_enabled(ssl) &&
+    return mbedtls_ssl_conf_tls13_ephemeral_enabled(ssl) &&
            ssl_tls13_client_hello_has_exts_for_ephemeral_key_exchange(ssl);
 #else
     ((void) ssl);