Fixed light index remapping.

ScriptableRenderPipeline/LightweightPipeline/LWRP/LightweightPipeline.cs

                 {
                     VisibleLight light = visibleLights[i];
                     if (light.lightType == LightType.Directional)
+                    {
+                        ++directionalLightCount;
+                    }
                     else
                         perObjectLightIndexMap[i] -= directionalLightCount;
                 }