Per review: scePadSetAngularVelocityDeadbandState now returns PAD_ERROR_INVALID_HANDLE for a
handle other than PAD_HANDLE, like the neighbouring setters. Enabling the dead band still throws,
because the angular-velocity reading path does not apply the filter (that would change input, not
UI, so it is not a silent stub); disabling it succeeds, which matches the unfiltered readings.
The test checks the disabled call, the bad handle, and no longer asserts the enabled path.
e4bc4a4ecb