accounts/usbwallet, vendor: switch from HID to generic USB lib

accounts/usbwallet/trezor.go

@@ -36,8 +36,6 @@ import (
 	"github.com/golang/protobuf/proto"
 )
 
-var ErrInvalidDeviceType = errors.New("trezor: invalid device type")
-
 // ErrTrezorPINNeeded is returned if opening the trezor requires a PIN code. In
 // this case, the calling application should display a pinpad and send back the
 // encoded passphrase.