[refactor] Drop unused state.DoS(), state.GetDoS(), state.CorruptionPossible()
[refactor] Drop unused state.DoS(), state.GetDoS(), state.CorruptionPossible()

Co-authored-by: Anthony Towns <aj@erisian.com.au>

Former-commit-id: f7d41cf3d0d36042318ca05496b47913586292d6
syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin