fix: test link in html reporter

[danny0838]

PR Checklist

• [x] Addresses an existing open issue: fixes #5102
• [x] That issue was marked as status: accepting prs
• [x] Steps in CONTRIBUTING.md were taken

Overview

Fix as mentioned in the related issue comment.

[linux-foundation-easycla[bot]]

The committers listed above are authorized under a signed CLA.

• :white_check_mark: login: dependabot[bot] (708e5f059b641af0c1d9851d4b2767aff9f782d0)
• :white_check_mark: login: JoshuaKGoldberg / name: Josh Goldberg ✨ (473e7d81da84f40fb50762ae97f2efb758b55097)
• :white_check_mark: login: danny0838 / name: Danny Lin (6e8bcdf6399400eb89be694afa0f26286065ff9c)

[JoshuaKGoldberg]

Oh, and - please sign the CLA so we can accept this @danny0838.