Fix SK6812 PWM channel initialization on BlackPill - #2
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Fixes #1
The SK6812 output on the BlackPill uses PB1 / TIM3 channel 4, but
sk6812_init()always initialized channel 1.This change selects the correct output-compare initialization function for each board.
I tested it successfully on an STM32F411CEU6 BlackPill (25 MHz), MiniDev Shield v6 and SK6812 RGBW LEDs.