wgl: The default swap interval is supposed to be 1
Per WGL_EXT_swap_control:
The default swap interval is 1.
Picking this patch from !17568 (closed) - I'm not convinced claiming the swapcontrol tearing extension is wise without a proper implementation, and I wasn't confident that this was the right change to make, since it means that GL benchmark apps would have to turn off VSync explicitly. But, I'm seeing productivity apps that are getting tearing behavior when they really shouldn't, and that plus the fact that this technically follows the spec makes me think this is the right change to make.