server: take virtual tx row locks in canonical order

Erik De Smedtrequested to merge
fix-register-vtxo-deadlock into master

This fixes a flake I observed in CI. See commit message for more details

  • check or remove this line after you've added a CHANGELOG entry or if your PR doesn't need one (they should go into CHANGELOG/unreleased/)
Edited by Erik De Smedt

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