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color: restore ext_linear min_lum

Pekka Paalanen requested to merge pq/wayland-protocols:mr/extlinmin into color

This changes the ext_linear default primary color volume minimum back to 0.2 cd/m². This is consistent with the sRGB reference display characteristics, like with all other transfer functions except st2084_pq and hlg.

The purpose is that whether content uses srgb, gamma22 or ext_linear transfer function, it occupies the same (sRGB SDR) dynamic range by default.

For rendering intents that employ black-point compensation, including the perceptual rendering intent, this changes nothing.

The set_luminances request can be used to set more appropriate values as necessary.

Suggested-by: @swick

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