test: update bumpfee testing from totalFee to fee_rate
test: update bumpfee testing from totalFee to fee_rate

Former-commit-id: 963582e6f741db213cc0c4684882267750749d54
syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin