Clear coat fresnel fix #4657
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Clear coat fresnel fix #4657
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Description
Fixes issues related to clear coat and specularity factor. Clear coat should use a white fresnel and weight that against the other layers.
Specularity factor should only be used in case specular color with metalness is enabled.
Actually, we supply the reflectivity factor twice and it's saved in both ccReflections.a and ccSpecularity, as the material_clearCoat and material_clearCoatReflectivity is the same value, so in the combine we can get away with just using ccSpecularity.
Fixes #4459.