also notify users interested in leaderboard correction changes if only a single competitor was changed

Change-Id: I67f37d60679b96e3a3dd4c640e24f61f580428f6

java/com.sap.sailing.server/src/com/sap/sailing/server/impl/RacingEventServiceImpl.java

@@ -1696,6 +1696,8 @@ public class RacingEventServiceImpl implements RacingEventService, ClearStateTes
                                 leaderboard.getName()).start();
                 lastNotificationForCompetitor.put(competitor, now);
             }
+            // a change to a single competitor also means a change to the leaderboard
+            notifyForLeaderboardIfNotAlreadyNotifiedRecently();
         }
 
     }