Fix porting from ORNYMG

Author: Csantucci

Source/RunActivity/Viewer3D/DynamicTrack.cs

@@ -717,7 +717,6 @@ public void Mark()
             foreach (LOD lod in LODs)
                 lod.Mark();
         }
-
     }
 
     public class LOD

Source/RunActivity/Viewer3D/World.cs

@@ -117,7 +117,6 @@ public void Load()
                     Terrain.Mark();
                     Scenery.Mark();
                     Viewer.TRP?.TrackProfile?.Mark();
-                    Viewer.TRP?.TrackProfileTun?.Mark();
                     Trains.Mark();
                     RoadCars.Mark();
                     Containers.Mark();