Simplify the assignment of override

registry/base_configuration_listener.go

@@ -101,7 +101,7 @@ func ToConfigurators(urls []*common.URL, f func(url *common.URL) config_center.C
 			break
 		}
 
-		var override map[string][]string = url.GetParams()
+		override := url.GetParams()
 		delete(override, constant.ANYHOST_KEY)
 		if len(override) == 0 {
 			configurators = nil