Fix scripting light test with enableReflector true by default

Author: sebastienlagarde

com.unity.render-pipelines.high-definition/Runtime/Scripting/GameObjectExtension.cs

@@ -17,6 +17,9 @@ public static HDAdditionalLightData AddHDLight(this GameObject gameObject, HDLig
 
             HDAdditionalLightData.InitDefaultHDAdditionalLightData(hdLight);
 
+            // Reflector have been change to true by default in the UX, however to not break compatibility
+            // with previous 2020.2 project that use light scripting we must keep reflector to false for scripted light
+            hdLight.enableSpotReflector = false;
             hdLight.SetLightTypeAndShape(lightTypeAndShape);
 
             return hdLight;