Home key toggles the keyboard backlight but wasn't going through
checkDisplayOn() like every other TCA8418 key, so it couldn't wake a
sleeping display or extend the auto-off timer.
Also: removed a no-op #elif branch in ST7789Display.cpp (same values as
the #else it duplicated), and ENABLE_SCREENSHOT on the Cardputer ADV
solo env, which does nothing since ST7789Display has no getBuffer().
MarekZegare4
64d4b2982b