fix cubemap loading for ligth cookie asset
fix cubemap loading for ligth cookie asset

MicroWorldwide/PlayCanvas,H1Gdev/engine,guycalledfrank/engine,H1Gdev/engine,aidinabedi/playcanvas-engine,aidinabedi/playcanvas-engine,guycalledfrank/engine,playcanvas/engine,sereepap2029/playcanvas,sereepap2029/playcanvas,MicroWorldwide/PlayCanvas,sereepap2029/playcanvas,playcanvas/engine