Update Source/Scene/ShadowMap.js
Update Source/Scene/ShadowMap.js

Co-authored-by: Eli Bogomolny <1fc44b58fa0cf37878f5e630388e13ebaedac508@users.noreply.github.com>
CesiumGS/cesium,likangning93/cesium,CesiumGS/cesium,likangning93/cesium,AnalyticalGraphicsInc/cesium,likangning93/cesium,CesiumGS/cesium,likangning93/cesium,AnalyticalGraphicsInc/cesium,likangning93/cesium,CesiumGS/cesium,CesiumGS/cesium