test: fix shadow-dom example test

[dalibortosic00]

Description
Fixes an integration test introduced in #5648

Checks

• The new code matches the existing patterns and styles.
• The tests pass with yarn test.
• The linter passes with yarn lint. (Fix errors with yarn fix.)
• The relevant examples still work. (Run examples with yarn start.)

[changeset-bot]

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Latest commit: 2bd71f4

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