Fix some problems in d3d depal

Still doesn't work.  I'm not sure why.  Both commits I thought, "aha, I've got it."

I made the shader statically output red, and it doesn't render red, so it's not even drawing.  Debug says the vertex decl is wrong, but replacing SetFVF with `pD3Ddevice->SetVertexDeclaration(pFramebufferVertexDecl);` fixes that without fixing the rendering.

`DrawActiveTexture()` uses `DrawPrimitiveUP()`, so I tried that, no difference either.  The result seems to always be black.

-[Unknown]