Fix option placement.

src/libserver/cfg_rcl.c

@@ -1279,6 +1279,11 @@ rspamd_rcl_config_init (void)
 		rspamd_rcl_parse_struct_integer,
 		G_STRUCT_OFFSET (struct rspamd_config, dns_max_requests),
 		RSPAMD_CL_FLAG_INT_32);
+	rspamd_rcl_add_default_handler (sub,
+		"classify_headers",
+		rspamd_rcl_parse_struct_string_list,
+		G_STRUCT_OFFSET (struct rspamd_config, classify_headers),
+		0);
 
 	/* New DNS configuration */
 	ssub = rspamd_rcl_add_section (&sub->subsections, "dns", NULL,
@@ -1313,11 +1318,6 @@ rspamd_rcl_config_init (void)
 		rspamd_rcl_parse_struct_integer,
 		G_STRUCT_OFFSET (struct rspamd_config, dns_io_per_server),
 		RSPAMD_CL_FLAG_INT_32);
-	rspamd_rcl_add_default_handler (ssub,
-		"classify_headers",
-		rspamd_rcl_parse_struct_string_list,
-		G_STRUCT_OFFSET (struct rspamd_config, classify_headers),
-		0);
 
 
 	/* New upstreams configuration */