chain: Remove UB CChain comparison
chain: Remove UB CChain comparison

It was unused, and had UB


Former-commit-id: febee49d6b5bcece9ad1b4ab4ecd6f383ee0587c
syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin