bitcoin-wallet: Use PACKAGE_NAME in usage help
bitcoin-wallet: Use PACKAGE_NAME in usage help

Former-commit-id: 2e23d0c700cc3cca587e00eab12ae5d64cbd7c1c
syscoin/syscoin2,syscoin/syscoin2,syscoin/syscoin,syscoin/syscoin2,syscoin/syscoin,syscoin/syscoin2,syscoin/syscoin2,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin2,syscoin/syscoin,syscoin/syscoin