With the addition of F82 tinting to the Principled BSDF, metals now use
the specular tint parameter.
This can cause issues when converting materials from older versions
of Blender to newer versions if the Specular Tint isn't handled
properly for these materials.
This commit attempts to fix this by adjusting the Specular Tint color
based on the Metallic input to try and keep converted materials
consistent with older versions of Blender.
Thank you to @LukasStockner for helping out.
Pull Request: https://projects.blender.org/blender/blender/pulls/114518
020f6ec0ff