Update materials for engine-only cube maps too.
Update materials for engine-only cube maps too.

3DGEOM/engine,aidinabedi/playcanvas-engine,horryq/engine-1,RainsSoft/engine,3DGEOM/engine,maxwellalive/engine,SuperStarPL/engine,nizihabi/engine,sanyaade-teachings/engine,guycalledfrank/engine,shinate/engine,MicroWorldwide/PlayCanvas,shinate/engine,SuperStarPL/engine,sereepap2029/playcanvas,H1Gdev/engine,H1Gdev/engine,maxwellalive/engine,guycalledfrank/engine,MicroWorldwide/PlayCanvas,sanyaade-teachings/engine,RainsSoft/engine,shinate/engine,nizihabi/engine,horryq/engine-1,3DGEOM/engine,sanyaade-teachings/engine,sereepap2029/playcanvas,playcanvas/engine,playcanvas/engine,aidinabedi/playcanvas-engine,SuperStarPL/engine,RainsSoft/engine,nizihabi/engine,maxwellalive/engine,sereepap2029/playcanvas,horryq/engine-1