fix(tests): rustfmt layout for corpus_cli_dispatch (rust-ci fmt red on #418)

[hyperpolymath]

Summary

Follow-up to #418 (merged). Its `Rust CI` run on `main` (7fd369d) failed at Cargo fmt; Cargo check passed, clippy was skipped.

This PR changes only `tests/corpus_cli_dispatch.rs` layout to match rustfmt:

• `SUPPORTED` becomes a whitespace-separated string constant (rustfmt packs literal arrays into mixed rows)
• one `assert!` whose arguments exceed `fn_call_width` is split vertically

No behaviour change.

Notes

• Job logs were unavailable from the sandbox (blob download EOF), so the fmt diagnosis comes from the per-step result (`Cargo fmt` = failure, `Cargo check` = success) plus a manual check against rustfmt rules. rustfmt itself could not be run here (crates.io and static.rust-lang.org are not reachable).
• Clippy and the test job have not run on this code yet; they are gated behind fmt in the same job, so CI is the next check.

[coderabbitai]

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• tests/corpus_cli_dispatch.rs

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