doubled RGB->GRB fix

[thijses]

First of all, nice library, thank you for taking the time to do the low level register stuff, it's saved me some frustration :).

I noticed that in the write_string function, you pass the contents of the RGB struct in GRB order to the write(R,G,B) function:

Nano_Every_WS2812B/src/Nano_Every_WS2812B.cpp

Line 75 in 832af0a

write(led_data[i].g,led_data[i].r,led_data[i].b);

isn't this a double re-ordering (because the write() function expects (r,g,b) input, and writes the data as (g,r,b) to the LED):

Nano_Every_WS2812B/src/Nano_Every_WS2812B.cpp

Lines 62 to 67 in 832af0a

	void CI_WS2812B::write(uint8_t red, uint8_t green, uint8_t blue)
	{
	SPI_transfer(green);
	SPI_transfer(red);
	SPI_transfer(blue);
	}

[ClemensAtElektor]

Thank you for your comments. The code just swaps red and green, it is not reordering twice. I don't remember why, sorry. The colors probably got mixed up somewhere.