fix: respect user's choice on Oval background color

[ThallesP]

Description of changes

Enables the developer to specify the Oval background color instead of hard-coding it to be white.

Description of how you validated changes

We've tested this and confirmed that the liveness flow process still proceeds without any problems when a different color is applied.

Checklist

• Have read the Pull Request Guidelines
• PR description included
• yarn test passes and tests are updated/added
• PR title and commit messages follow conventional commit syntax
• If this change should result in a version bump, changeset added (This can be done after creating the PR.) This does not apply to changes made to docs, e2e, examples, or other private packages.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[changeset-bot]

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Latest commit: 329ed56

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