vo_opengl: remove scale-sep and indirect options

These are now auto-detected sanely; and enabled whenever it would be a
performance or quality gain (which is pretty much everything except
bilinear/bilinear scaling).

Perhaps notably, with the absence of scale_sep, there's no more way to
use convolution filters on hardware without FBOs, but I don't think
there's hardware in existence that doesn't have FBOs but is still fast
enough to run the fallback (slow) 2D convolution filters, so I don't
think it's a net loss.

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