[Fix] Fix the bounding sphere calculation for spot lights (#4800)
[Fix] Fix the bounding sphere calculation for spot lights (#4800)

* [Fix] Fix the bounding sphere calculation for spot lights

* lint

* small improvement

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