Fix a struct overflow case in WII_IPC_HLE_Device_hid.cpp

`WiiHIDDeviceDescriptor` is 20 bytes in size (2 of which are padding bytes)

`libusb_device_descriptor` on the other hand is 18 bytes (does not have the 2 padding bytes).

So we were pulling 20 bytes out of an 18 byte struct, which isn't really correct.