fixed number of neopixels in case of Needle(Number of pixels)

[kitazaki]

I tested neopixel node with M5Atom Matrix.

in case 1, 2nd pixel changed. in case 2, 3rd pixel changed. ... in case 24, 25th pixel changed. in case 25, not changed.

because of the start number is increased by i++ in fill() function.

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