Switch box-reflection example to refresh envmap every 10 frames (#3992)
Switch box-reflection example to refresh envmap every 10 frames (#3992)

Co-authored-by: Martin Valigursky <2113fa600d719248203230de1894fe2542067d96@snapchat.com>
MicroWorldwide/PlayCanvas,playcanvas/engine,MicroWorldwide/PlayCanvas,playcanvas/engine