d3d: Fix EnumAdapterModes and add an adapter mode format test

[Chris Robinson]

This patch fixes D3D adapter mode enumeration, which clears some issues some 
games had when starting (eg. Morrowind being unable to set a mode). I've 
added an adapter test (modified from the texture test) to D3D 9 which tests 
all the D3DFORMAT types.

Apologies for the macro (a)buse in the test, but it would've been more 
combersome to have to manually make strings for each of the modes without it.
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