Fix Windows cleanup in deleted-mail recovery tests

[bcbetterninja]

Windows checks and the master build failed after the two legacy deleted-mail recovery cases completed their assertions: cleanup could not delete mail.db because the direct SQLite fixture connection remained pooled after disposal.

Disable pooling on that temporary legacy-payload writer so disposal releases its file handle before the encrypted test database is removed.

Validation: solution build passed with zero warnings/errors; all 12 deleted-mail recovery regression cases passed locally. Windows, Linux, macOS and CodeQL checks passed, including the full 579-test suite on Windows.

[coderabbitai]

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