MissionController.cc: fix plan distance not being properly displayed

src/MissionManager/MissionController.cc

@@ -1756,7 +1756,7 @@ void MissionController::_recalcMissionFlightStatus()
     }
 
     emit missionMaxTelemetryChanged     (_missionFlightStatus.maxTelemetryDistance);
-    //emit missionDistanceChanged         (_missionFlightStatus.totalDistance);
+    emit missionDistanceChanged         (_missionFlightStatus.totalDistance);
     emit missionHoverDistanceChanged    (_missionFlightStatus.hoverDistance);
     emit missionCruiseDistanceChanged   (_missionFlightStatus.cruiseDistance);
     emit missionTimeChanged             ();