wined3d: Properly handle backbuffer_width/_height=0 in wined3d_device_reset. (try 2)

[Sam Edwards]

This time I reworked the patch from scratch to make it a bit more 
obvious what's going on.

I've also added tests for resetting to fullscreen with 
BackBufferWidth/Height = 0, as well as made it more clear that the 
function indeed returns WINED3DERR_INVALIDCALL under such circumstances.
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