Fix PolylineCollection indices arrays (#5538)
Fix PolylineCollection indices arrays (#5538)

A 64K buffer limit overflow test was wrong, leading to out-of range vertice indices.

wallw-bits/cesium,jasonbeverage/cesium,soceur/cesium,AnalyticalGraphicsInc/cesium,emackey/cesium,ggetz/cesium,hodbauer/cesium,emackey/cesium,josh-bernstein/cesium,CesiumGS/cesium,oterral/cesium,likangning93/cesium,progsung/cesium,wallw-bits/cesium,ggetz/cesium,geoscan/cesium,emackey/cesium,likangning93/cesium,wallw-bits/cesium,wallw-bits/cesium,hodbauer/cesium,emackey/cesium,soceur/cesium,CesiumGS/cesium,NaderCHASER/cesium,oterral/cesium,AnalyticalGraphicsInc/cesium,kaktus40/cesium,likangning93/cesium,CesiumGS/cesium,NaderCHASER/cesium,progsung/cesium,ggetz/cesium,ggetz/cesium,geoscan/cesium,oterral/cesium,jasonbeverage/cesium,YonatanKra/cesium,CesiumGS/cesium,hodbauer/cesium,NaderCHASER/cesium,soceur/cesium,likangning93/cesium,YonatanKra/cesium,YonatanKra/cesium,likangning93/cesium,CesiumGS/cesium,kaktus40/cesium,josh-bernstein/cesium,YonatanKra/cesium