fix: "return" always overrode "error_page" response code

src/http/modules/ngx_http_rewrite_module.c

diff --git a/src/http/modules/ngx_http_rewrite_module.c b/src/http/modules/ngx_http_rewrite_module.c
index 6db1bc0..3192375 100644
--- a/src/http/modules/ngx_http_rewrite_module.c
+++ b/src/http/modules/ngx_http_rewrite_module.c
@@ -178,7 +178,11 @@
         code(e);
     }
 
-    return e->status;
+    if (r->err_status == 0) {
+        return e->status;
+    }
+
+    return r->err_status;
 }