* ctb: Add leftmost bond payout rule to FDG

* Update packages/contracts-bedrock/test/dispute/FaultDisputeGame.t.sol
Co-authored-by: clabby <ben@clab.by>

* address @clabby's review

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Co-authored-by: clabby <ben@clab.by>
Co-authored-by: Matthew Slipper <me@matthewslipper.com>