test: Format feature_fee_estimation with pep8
test: Format feature_fee_estimation with pep8

Former-commit-id: 6bbd6a3dc55609acbc099d9b2ed32c65f03375ac
syscoin/syscoin2,syscoin/syscoin,syscoin/syscoin2,syscoin/syscoin,syscoin/syscoin2,syscoin/syscoin,syscoin/syscoin2,syscoin/syscoin2,syscoin/syscoin2,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin