When testing serializing revocation log, we need to also copy its `HTLCEntries` as the serialization of the HTLC involves a writing to the `htlc.amtTlv` field.
When testing serializing revocation log, we need to also copy its `HTLCEntries` as the serialization of the HTLC involves a writing to the `htlc.amtTlv` field.