make logic more clear

src/http/modules/ngx_http_userid_filter_module.c

diff --git a/src/http/modules/ngx_http_userid_filter_module.c b/src/http/modules/ngx_http_userid_filter_module.c
index 8304e0b..6294628 100644
--- a/src/http/modules/ngx_http_userid_filter_module.c
+++ b/src/http/modules/ngx_http_userid_filter_module.c
@@ -199,7 +199,7 @@
 
     conf = ngx_http_get_module_loc_conf(r, ngx_http_userid_filter_module);
 
-    if (conf->enable <= NGX_HTTP_USERID_LOG) {
+    if (conf->enable < NGX_HTTP_USERID_V1) {
         return ngx_http_next_header_filter(r);
     }