vf_scale: use colorspace negotiation API

This filter will always accept any input format, even if the user sets
a specific in_range/in_color_matrix. This is to preserve status quo with
current behavior, where passing a specific in_color_matrix merely
overrides the incoming frames' attributes. (Use `vf_format` to force
a specific input range)

Because changing colorspace and color_range now requires reconfiguring
the link, we can lift sws_setColorspaceDetails out of scale_frame and
into config_props. (This will also get re-called if the input frame
properties change)

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