Fix light intensity upgrade for disabled lights

com.unity.render-pipelines.high-definition/HDRP/Editor/Lighting/HDLightEditor.cs

 
             if (m_UpdateAreaLightEmissiveMeshComponents)
                 UpdateAreaLightEmissiveMeshComponents();
+            
+            // If the light is disabled in the editor we force the light upgrade from his inspector
+            foreach (var additionalLightData in m_AdditionalLightDatas)
+                additionalLightData.UpgradeLight();
         }
 
         void DrawFoldout(SerializedProperty foldoutProperty, string title, Action func)

com.unity.render-pipelines.high-definition/HDRP/Lighting/Light/HDAdditionalLightData.cs

             {
                 // Note: We can't access to the light component in OnAfterSerialize as it is not init() yet,
                 // so instead we use a boolean to do the upgrade in OnEnable().
-                // However if the light is not enabled, the light is not upgraded.
-                // To solve this issue we add a callback below that will force OnEnable() to upgrade the light.
-#if UNITY_EDITOR
-                EditorApplication.update += EditorOnEnableWorkaround;
-#endif
-
-            version = currentVersion;
-#if UNITY_EDITOR
-        // See comment above, this is a workaround to upgrade Disabled light correctly.
-        void EditorOnEnableWorkaround()
+        private void OnEnable()
-            OnEnable();
-            EditorApplication.update -= EditorOnEnableWorkaround;
+            UpgradeLight();
-#endif
-        private void OnEnable()
+        public void UpgradeLight()
         {
             if (needsIntensityUpdate_1_0)
             {
                 }
 #pragma warning restore 0618
             }
+
+            version = currentVersion;
         }
     }
 }