Fix clear coat coarse energy conservation

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Material/Lit/Lit.hlsl

     bool pixelHasTransmission = materialFeatureId == GBUFFER_LIT_TRANSMISSION_SSS || materialFeatureId == GBUFFER_LIT_TRANSMISSION;
     bool pixelHasAnisotropy   = materialFeatureId == GBUFFER_LIT_ANISOTROPIC;
     bool pixelHasIridescence  = materialFeatureId == GBUFFER_LIT_IRIDESCENCE;
-    bool pixelHasClearCoat    = coatMask > 0;
+    bool pixelHasClearCoat    = coatMask > 0.0;
 
     // Disable pixel features disabled by the tile.
     pixelFeatureFlags |= tileFeatureFlags & (pixelHasSubsurface   ? MATERIALFEATUREFLAGS_LIT_SUBSURFACE_SCATTERING : 0);
         // Note: The modification of the base roughness and fresnel0 by the clear coat is already handled in FillMaterialClearCoatData
 
         // Very coarse attempt at doing energy conservation for the diffuse layer based on NdotL. No science.
-        diffuseLighting *= lerp(1, F_Schlick(CLEAR_COAT_F0, NdotL), bsdfData.coatMask);
+        diffuseLighting *= lerp(1, 1.0 - coatF, bsdfData.coatMask);
     }
 }