WineD3D: request alpha in backbuffer mode, to work correctly with multiple opengl pixel formats

[Roderick Colenbrander]

Hi,

In the default backbuffer based renderer in WineD3D the front and backbuffer share the same pixel format while D3D itself decouples them. A lot of applications use alpha on the backbuffer, so make sure we have alpha. This change is needed because the single pixel format which we had before always had alpha.

Regards,
Roderick Colenbrander
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