st7789: Remove mystery meat command implicated by #567. #4681

Job	Run time
pico (RPI_PICO)	2m 21s
picow (RPI_PICO_W)	2m 19s
tiny2040 (PIMORONI_TINY2040)	2m 13s
picolipo_4mb (PIMORONI_PICOLIPO_4MB)	2m 38s
picolipo_16mb (PIMORONI_PICOLIPO_16MB)	2m 18s
tufty2040 (PIMORONI_TUFTY2040)	2m 25s
enviro (PICO_W_ENVIRO)	2m 5s
galactic_unicorn (RPI_PICO_W)	2m 33s
cosmic_unicorn (RPI_PICO_W)	2m 2s
stellar_unicorn (RPI_PICO_W)	2m 13s
inky_frame (PICO_W_INKY)	2m 0s
	25m 7s

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