[ambient-light] Align with Web IDL specification

Author: autokagami

index.bs

@@ -231,8 +231,9 @@ The AmbientLightSensor Interface {#ambient-light-sensor-interface}
 --------------------------------
 
 
-  [Constructor(optional SensorOptions sensorOptions = {}), SecureContext, Exposed=Window]
+  [SecureContext, Exposed=Window]
   interface AmbientLightSensor : Sensor {
+    constructor(optional SensorOptions sensorOptions = {});
     readonly attribute double? illuminance;
   };