remove varint from mintsys
remove varint from mintsys

these two fields wont compress via varint over long term


Former-commit-id: 382b9e86e391d173a25e8860a045ecc001887521
syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin