Remove misplaced comment in TLS 1.3 ciphersuite definitions

Signed-off-by: Hanno Becker <hanno.becker@arm.com>
diff --git a/library/ssl_ciphersuites.c b/library/ssl_ciphersuites.c
index 1df1b26..9a416c8 100644
--- a/library/ssl_ciphersuites.c
+++ b/library/ssl_ciphersuites.c
@@ -334,8 +334,7 @@
       MBEDTLS_KEY_EXCHANGE_NONE, /* Key exchange not part of ciphersuite in TLS 1.3 */
       MBEDTLS_SSL_MAJOR_VERSION_3, MBEDTLS_SSL_MINOR_VERSION_4,
       MBEDTLS_SSL_MAJOR_VERSION_3, MBEDTLS_SSL_MINOR_VERSION_4,
-          0 // field not used in TLS 1.3 implementation
-    },
+      0 },
 #endif /* MBEDTLS_CHACHAPOLY_C && MBEDTLS_SHA256_C */
 #endif /* MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL */