dinput: Default value for unassigned POVs should be -1

[Vitaliy Margolen]

Should fix bugs 7800 and 11072.
---
 dlls/dinput/device.c         |    7 +++++--
 dlls/dinput/tests/joystick.c |    7 +++++++
 2 files changed, 12 insertions(+), 2 deletions(-)
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