chore: apply rustfmt

[PastaPastaPasta]

Issue being fixed or feature implemented

Fixes a cargo fmt --check --all failure on current v3.1-dev by applying rustfmt to packages/rs-platform-wallet-ffi/src/persistence.rs.

Root cause: the trailing blank line was introduced by commit 14f3f6845c8 (feat(swift-sdk): PlatformWalletManager.deleteWallet wipes full wallet footprint) and merged through PR #3653, feat(swift-sdk): deleteWallet wipes full wallet footprint.

What was done?

• Removed the extra trailing blank line at the end of packages/rs-platform-wallet-ffi/src/persistence.rs.

How Has This Been Tested?

• cargo fmt --check --all

This pull request was created by Codex.

Breaking Changes

None.

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have added "!" to the title and described breaking changes in the corresponding section if my code contains any
• I have made corresponding changes to the documentation if needed

For repository code-owners and collaborators only

• I have assigned this pull request to a milestone

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 1f182a6f-e74b-4aeb-b4dd-931121a8da40

📥 Commits

Reviewing files that changed from the base of the PR and between 36c5908 and 20d3dd9.

📒 Files selected for processing (1)

• packages/rs-platform-wallet-ffi/src/persistence.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/fix-platform-wallet-ffi-fmt

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[thepastaclaw]

Review Gate

Commit: 20d3dd92

• ⏳ Debounce: 3m ago (need 30m)

• ⏳ CI checks: build failure: PR title

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