fix wrong prefiltered cubemap overriding due to skybox uniforms being reset on materials (#957)
fix wrong prefiltered cubemap overriding due to skybox uniforms being reset on materials (#957)


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