ci: fix prettier arg

[mrienstra]

Changes

• pnpm run format --list
  • ↳ pnpm run format:code --list
    • ↳ prettier -w . --cache --plugin-search-dir=. --list
• [warn] Ignored unknown option --list. <-- spotted in CI output
• --list-different would work
• --check outputs "a human-friendly message and a list of unformatted files, if any."
• In this case, since we're not trying to do anything in particular with the output, might as well go for "human-friendly"
• Originally added in fix failing format command in CI #2696

Testing, Docs

n/a

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Latest commit: fd01691

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[jasikpark]

lgtm