[Meta] Fix i18n end-to-end test about perseus HOT 5 CLOSED

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Error log:

---- main stdout ----
thread 'main' panicked at 'assertion failed: `(left == right)`
  left: `""`,
 right: `"Hello, \u{2068}User\u{2069}!"`', examples/core/i18n/tests/main.rs:16:5
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

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Also, this is less inconvenient now that the matrix is set up to not fail-fast, meaning everything is run anyway so we can actually see exactly what failed each time.

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Noting that I haven't seen this bug since capsules were merged, so I may have fixed something at some stage accidentally...closing very tentatively for now...

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Well, that was predictable.

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