emulator/opengl: Fix Windows EGL queryConfigs().

The function uses DescribePixelFormat() which doesn't return a
count, but a maximum index, in a base-1 list of possible formats,
so adjust the code accordingly.

See http://msdn.microsoft.com/en-us/library/windows/desktop/dd318302(v=vs.85).aspx

Change-Id: Id0cc92249348e6c845570adaaf4c280721a194bb
1 file changed