fixed tileset typo
fixed tileset typo

CesiumGS/cesium,YonatanKra/cesium,likangning93/cesium,likangning93/cesium,YonatanKra/cesium,CesiumGS/cesium,likangning93/cesium,YonatanKra/cesium,AnalyticalGraphicsInc/cesium,CesiumGS/cesium,progsung/cesium,CesiumGS/cesium,CesiumGS/cesium,likangning93/cesium,progsung/cesium,AnalyticalGraphicsInc/cesium,likangning93/cesium,YonatanKra/cesium