input/seat: don't configure mappings for switches

Switch devices cannot be mapped to an output/region, stop trying
to do so.

sway/input/seat.c

@@ -834,7 +834,6 @@ static void seat_configure_switch(struct sway_seat *seat,
 	if (!seat_device->switch_device) {
 		sway_switch_create(seat, seat_device);
 	}
-	seat_apply_input_config(seat, seat_device);
 	sway_switch_configure(seat_device->switch_device);
 }