wgsl: Update CTS for AF fract

gpuweb / cts

WebGPU Conformance Test Suite

https://gpuweb.github.io/cts/

BSD 3-Clause "New" or "Revised" License

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Closed zoddicus closed 2 months ago

zoddicus commented 2 months ago

Spec changes in https://github.com/gpuweb/gpuweb/issues/4523 means that this should be updated

zoddicus commented 2 months ago

Since this depends on subtraction, it will probably need to be added to be done via lookup table