[fprint] UareU 4000B DigitalPersona image encrypted

[Bastien Nocera]

On Thu, 2018-08-23 at 13:19 +0000, Kleyson de Sousa Rios wrote:
> To test I'm basically using the examples/ tools, and seems that the
> drive_data has the correct value 5.

Looks like the device's output isn't always encrypted. Timo, could you
check whether this change makes sense? Kleyson, could you please test
it?

https://gitlab.freedesktop.org/libfprint/libfprint/merge_requests/13

Cheers