xace: Fake return values on denials in input polling requests.

Instead of returning BadAccess when "read" permission is denied
on a device, falsify the device state (buttons down, keys pressed).
This is nicer to applications, but may still have undesired side
effects.  The long-term solution is not to use these requests in
event-driven code!

Requests affected: QueryPointer, QueryKeymap, XiQueryDevice.

Signed-off-by: Eamon Walsh <ewalsh@tycho.nsa.gov>

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