message: telemetry_modes: remove unneeded namespace
diff: using namespace dronelink;
  -void print_mode(dronelink::Telemetry::FlightMode flight_mode);
  +void print_mode(Telemetry::FlightMode flight_mode);
  static Telemetry::FlightMode _flight_mode = Telemetry::FlightMode::UNKNOWN;
  TEST(Telemetry, FlightModes)
  