Revert workaround to filter JavaScriptFFI out on GHC versions where G… (backport #8979)

[mergify]

This is an automatic backport of pull request #8979 done by Mergify.
Cherry-pick of 8c9a71e has failed:

On branch mergify/bp/3.10/pr-8979
Your branch is up to date with 'origin/3.10'.

You are currently cherry-picking commit 8c9a71e67.
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  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

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	both modified:   Cabal/src/Distribution/Simple/GHC.hs

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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