Ensure that the "colour.CAM16*_to_XYZ" definitions call the correct underlying "colour.models.cam16_ucs.UCS_Li2017_to_XYZ" definition.
Ensure that the "colour.CAM16*_to_XYZ" definitions call the correct underlying "colour.models.cam16_ucs.UCS_Li2017_to_XYZ" definition.

Closes #914.
colour-science/colour