vo_opengl: color manage after interpolation

This moves the color management code out of pass_render_main (which is
now dedicated solely to up/downscaling and hence renamed pass_scale_main)
and into a new function, which gets called from pass_draw_to_screen
instead.

This makes more sense from a logical standpoint, and also means that we
interpolate in linear RGB, before color management - rather than after
it, which is significantly better for color accuracy and probably also
interpolation quality.

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