Add first waypoint to FlightData.

The first waypoint is automatically added by pydcs, so it's not
actually in our waypoint list from the flight planner. Import is from
the group so it shows up in the kneeboard.

gen/briefinggen.py

@@ -115,8 +115,6 @@ class BriefingGenerator(MissionInfoGenerator):
         self.description += "-" * 50 + "\n"
         self.description += f"{flight_unit_name} x {flight.size + 2}\n\n"
 
-        departure = flight.departure.airfield_name
-        self.description += f"#0 -- TAKEOFF : Take off from {departure}\n"
         for i, wpt in enumerate(flight.waypoints):
             self.description += f"#{i + 1} -- {wpt.name} : {wpt.description}\n"
         self.description += f"#{len(flight.waypoints) + 1} -- RTB\n\n"