d3d: Fix EnumAdapterModes and add an adapter mode format test

[H. Verbeet]

On 09/12/06, Chris Robinson <chris.kcat at gmail.com> wrote:
>+ * Copyright (C) 2006 Henri Verbeet
Except for perhaps the creation of the device, there's not a lot of
code I wrote in there. You should at least include your own name in
there.