Tiny logic fix to DriverBase._receive_colors.
Tiny logic fix to DriverBase._receive_colors.

ManiacalLabs/BiblioPixel,rec/BiblioPixel,ManiacalLabs/BiblioPixel,rec/BiblioPixel,rec/BiblioPixel,ManiacalLabs/BiblioPixel,rec/BiblioPixel,ManiacalLabs/BiblioPixel