Rename new_session_ticket state

Both client and server side use
`MBEDTLS_SSL_NEW_SESSION_TICKET` now

Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
diff --git a/library/ssl_tls12_client.c b/library/ssl_tls12_client.c
index 7fa6443..2405208 100644
--- a/library/ssl_tls12_client.c
+++ b/library/ssl_tls12_client.c
@@ -3627,7 +3627,7 @@
     if( ssl->state == MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC &&
         ssl->handshake->new_session_ticket != 0 )
     {
-        ssl->state = MBEDTLS_SSL_SERVER_NEW_SESSION_TICKET;
+        ssl->state = MBEDTLS_SSL_NEW_SESSION_TICKET;
     }
 #endif
 
@@ -3704,7 +3704,7 @@
         *        Finished
         */
 #if defined(MBEDTLS_SSL_SESSION_TICKETS)
-       case MBEDTLS_SSL_SERVER_NEW_SESSION_TICKET:
+       case MBEDTLS_SSL_NEW_SESSION_TICKET:
            ret = ssl_parse_new_session_ticket( ssl );
            break;
 #endif