FlightTasks: remove description from cpp files

src/lib/FlightTasks/tasks/FlightTaskManual.cpp

src/lib/FlightTasks/tasks/FlightTaskManualAltitude.cpp

src/lib/FlightTasks/tasks/FlightTaskManualPosition.cpp

src/lib/FlightTasks/tasks/FlightTaskManualStabilized.cpp

src/lib/FlightTasks/tasks/FlightTaskOrbit.cpp

src/lib/FlightTasks/tasks/FlightTaskSport.hpp