Fix issue with dumb code to load serialize old data

ScriptableRenderPipeline/HDRenderPipeline/AdditionalData/HDAdditionalLightData.cs

 
         // Only for Rectangle/Line/projector lights
         [Range(0.0f, 20.0f)]
+        [FormerlySerializedAs("lightLength")]
-        [FormerlySerializedAs("lightLength")]
+        [FormerlySerializedAs("lightWidth")]
-        // Only for Sphere/Disc
-        [FormerlySerializedAs("lightWidth")]
+        // Only for Sphere/Disc        
         public float shapeRadius = 0.0f;
 
         // Only for Spot/Point - use to cheaply fake specular spherical area light