Shaders: Update the Schlick formula signature #22316
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WestLangley
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This PR reverts a change made in #22156, which introduced F90 as a
vec3. We only support monochromatic F90, so that variable is changed to afloat.This also avoids having to instantiate a
vec3when the Schlick method is called.Unity and Filament also consider F0 as a
vec3and F90 as afloat.