[bug] Hide percent difference for WPT scores that are hidden

## Is the data shown different from the original source?

Hey folks, apologies, despite the instructions on how to check if the underlying data sources are identical, I could not find the data in the provided links. I'll post this here and feel free to close it directly. Or if someone can point me to exactly where I can find the data sources behind the test score % vs. test score absolute number of passing tests, I would appreciate it and happily open an issue in the right repo!

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I noticed on https://webstatus.dev/features/anchor-positioning?q=anchor+positioning that web platform test score % for Chrome and Edge is exceedingly low and does not match the absolute number of passing tests (408/425, or ~85%)