chore(ui-react-storage): clean up outdated styles file

[AllanZhengYP]

Description of changes

Clear the unused storage-browser-styles.css

Issue #, if available

Description of how you validated changes

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.

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[changeset-bot]

⚠️ No Changeset found

Latest commit: 679ce58

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[jordanvn]

Looks good to me. Confirmed that I didn't see any styling regression on build