fix(test): assert empty revert bytes for OutOfFunds in testFtsoV2LTSGetFeedPaid

[thedavidmeister]

Summary

• Fixes bare vm.expectRevert() calls in testFtsoV2LTSGetFeedPaid (issue [F27] [LOW] Bare vm.expectRevert() in paid test cannot distinguish OOF / insufficient-value from any other revert #78)
• Both underpaid getFeedValue calls trigger an EVM-level OutOfFunds error before FtsoV2 executes, producing empty revert data
• Replaced with vm.expectRevert(new bytes(0)) to explicitly assert no-data reverts; a future change that introduces a Solidity custom error would now correctly break the test

Closes #78

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: c4bcbf19-f32f-4339-80ee-ca349a899157

📥 Commits

Reviewing files that changed from the base of the PR and between cb20d03 and e495f3b.

📒 Files selected for processing (1)

• test/src/lib/lts/LibFtsoV2LTS.t.sol

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch issue-78-paid-revert-selector

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