message: Fixes warning on variable shadowing
  Rename variable so it does not shadow global variable PROTOCOL_VERSION
diff: @@ -225,9 +225,10 @@ void set_xversion_flags(CXVersionMessage &xver, const std::string &network)
  return;
  }
  - constexpr double PROTOCOL_VERSION = 1.4;
  + constexpr double ELECTRUM_PROTOCOL_VERSION = 1.4;
  xver.set_u64c(XVer::BU_ELECTRUM_SERVER_PORT_TCP, std::stoul(rpc_port(network)));
  - xver.set_u64c(XVer::BU_ELECTRUM_SERVER_PROTOCOL_VERSION, static_cast<uint64_t>(PROTOCOL_VERSION * 1000000));
  + xver.set_u64c(
  + XVer::BU_ELECTRUM_SERVER_PROTOCOL_VERSION, static_cast<uint64_t>(ELECTRUM_PROTOCOL_VERSION * 1000000));
  }
  } // ns electrum
  