MINOR: proto_htx: Directly call htx_check_response_for_cacheability()

Instead of using the HTTP legacy version.
diff --git a/src/proto_htx.c b/src/proto_htx.c
index 620f81b..2fd67f7 100644
--- a/src/proto_htx.c
+++ b/src/proto_htx.c
@@ -1989,7 +1989,7 @@
 	 * Check for cache-control or pragma headers if required.
 	 */
 	if ((s->be->options & PR_O_CHK_CACHE) || (s->be->ck_opts & PR_CK_NOC))
-		check_response_for_cacheability(s, rep);
+		htx_check_response_for_cacheability(s, rep);
 
 	/*
 	 * Add server cookie in the response if needed