Fix debounce initialization for GPIO_SW4#1
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init_sw_pins() passes GPIO_SW3 to both sm=2 and sm=3, leaving sm=3 watching the wrong pin. Since read_switch(3) drains sm=3's RX FIFO which never fills, SW4 never fires no matter how it's wired.
One-line fix: pass GPIO_SW4 to debounce_program_init(pio, 3, ...).
// Line 50