X11Drv: fix opengl pixel format bug

[Roderick Colenbrander]

Hi,

During my recent OpenGL cleanup I accidently added a bug which exposed itself 
on non-Nvidia drivers. My function get_fbconfig_from_main_visual returns an 
index which counts from 1. I forgot to substract 1 from it in 
ChoosePixelFormat which caused some issues.

Regards,
Roderick Colenbrander
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