trivial fix for bug3249: add TrackedRaceImpl instance as course litsener to CourseImpl after deserialization in readObject()

java/com.sap.sailing.domain/src/com/sap/sailing/domain/tracking/impl/TrackedRaceImpl.java

@@ -611,6 +611,7 @@ public abstract class TrackedRaceImpl extends TrackedRaceWithWindEssentials impl
      */
     private void readObject(ObjectInputStream ois) throws ClassNotFoundException, IOException, PatchFailedException {
         ois.defaultReadObject();
+        getRace().getCourse().addCourseListener(this);
         raceStates = new WeakHashMap<>();
         attachedRaceLogs = new ConcurrentHashMap<>();
         attachedRaceExecutionOrderProviders = new ConcurrentHashMap<>();