WGL: fix wglChoosePixelFormatARB behavior

[Roderick Colenbrander]

Hi,

According to the specs wglChoosePixelFormatARB returns the number of matching 
pixelformats. This number can be different than the size of the return buffer 
which is given by nFormats.

This bug wasn't bad before but that was because we only offered 1 pixelformat 
for onscreen and offscreen rendering.

Regards,
Roderick Colenbrander
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