chore: Fix unused var

[ioanabrooks]

Description of changes

Fix unused var issue in https://github.com/aws-amplify/amplify-ui/security/code-scanning/159

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• Have read the Pull Request Guidelines
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• Relevant documentation is changed or added (and PR referenced)
• yarn test passes and tests are updated/added
• No side effects or sideEffects field updated

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[ioanabrooks]

In a previous commit I removed the usage of the platform var (it was used to have a slower timeout on ios than android, but ios tests were flaky so using same timeout now). Didn't want to entirely remove the platform var since it may come in handy in the future. Using it in log for now.