DirectInput mouse button bug fixed (Oni now works)

[Neil Olver]

I've fixed a bug in the DirectInput code which prevented the mouse
buttons from working under Oni. It may effect other games as well, I
don't know.

Essentially, the flag for a mouse button down in the structure returned
by GetDeviceState should be 0x80 (only the high bit set), not 0xff. Most
games I imagine just check if the flag is zero; Oni compares it to 0x80.

MSDN appears to confirm this is the correct behaviour: 
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/directx9_c/directx/input/ref/structs/dimousestate.asp

I haven't been able to test this with much else - mouse buttons still
work in UFO Aftermath though.

-Neil 
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