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In this commit, we consolidate the number of areas where we derive our commitment keys. Before this commit, the `isOurCommitment` function in the chain watcher used a custom routine to derive the expected scripts/keys for our commitment at that height. With the recent changes, we now have additional logic in `DeriveCommitmentKeys` that wasn't copied over to this area. As a result, the prior logic would erroneously detect if it was our commitment that had hit the chain or not. In this commit, we remove the old custom code, and use `DeriveCommitmentKeys` wihtin the chain watcher as well. This ensures that we only need to maintain the key derivation code in a single place, preventing future bugs of this nature.