next-cube.c: move LED logic to new next_scr2_led_update() function

Ensure that the LED status is updated by calling next_scr2_led_update() whenever
the SC2 register is written.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Thomas Huth <huth@tuxfamily.org>
Message-ID: <20231220131641.592826-10-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Thomas Huth <huth@tuxfamily.org>
1 file changed