Fix WS2812 color order to GRB (matching BMC)

src/pixel_stomp_mux.cpp

@@ -18,7 +18,7 @@ void PixelStompMux::begin() {
 
     delay(100);
 
-    FastLED.addLeds<WS2812, 9, RGB>(leds, NUM_LEDS);
+    FastLED.addLeds<WS2812, 9, GRB>(leds, NUM_LEDS);
     FastLED.setMaxPowerInVoltsAndMilliamps(5, 500);
     FastLED.setBrightness(128);
     fill_solid(leds, NUM_LEDS, CRGB::Black);