[Test Coverage] Improve host-iptables.ts branch coverage from 83% to 99%#1691

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test-coverage/host-iptables-branch-coverage-7eaec73b4d4c6e4cgithub/gh-aw-firewall:test-coverage/host-iptables-branch-coverage-7eaec73b4d4c6e4cCopy head branch name to clipboard