Hide current version for HDAdditionalLightData

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

     [ExecuteInEditMode]
     public class HDAdditionalLightData : MonoBehaviour, ISerializationCallbackReceiver
     {
-        public const int currentVersion = 2;
+        private const int currentVersion = 2;
 
         [HideInInspector, SerializeField]
         [FormerlySerializedAs("m_Version")]
 #pragma warning disable 414
+        [SerializeField]
         private int m_Version = currentVersion;
 #pragma warning restore 414