Allow reprogramming USB vendor ID and product ID (VID/PID)

[satoshinm]

Currently it is hardcoded, but it would be nice to let the user change this VID/PID without rebuilding the firmware

pill_duck/src/main.c

Lines 47 to 48 in 0d6def8

	.idVendor = 0x05ac,
	.idProduct = 0x2227,