Use timing values more accurate to internal clock

main/rmt_leds.cpp

@@ -7,7 +7,7 @@ static const char *TAG = "rmt_leds";
 #include "rmt_leds.hpp"
 
 
-#define WS2811_PULSE_WIDTH_NS 833
+#define WS2811_PULSE_WIDTH_NS 825
 #define WS2811_RESET_WIDTH_US 300
 
 // Each pulse is divided into thirds - two high / one low for 1, vice versa for 0