hsv2rgb_rainbow: remove unneeded (and overflowing) +1 to color channels in the inlined, deconstructed version of nscale8_video.
hsv2rgb_rainbow: remove unneeded (and overflowing) +1 to color channels in the inlined, deconstructed version of nscale8_video.

remspoor/FastLED,kcouck/FastLED,NicoHood/FastLED,PaulStoffregen/FastLED,FastLED/FastLED,NicoHood/FastLED,kcouck/FastLED,PaulStoffregen/FastLED,eshkrab/FastLED-esp32,eshkrab/FastLED-esp32,tullo-x86/FastLED,FastLED/FastLED,PaulStoffregen/FastLED,tullo-x86/FastLED,remspoor/FastLED,FastLED/FastLED,FastLED/FastLED