don't use a display name for the regatta leaderboard created upon user request

java/com.sap.sailing.gwt.ui/src/main/java/com/sap/sailing/gwt/ui/adminconsole/CreateDefaultRegattaLeaderboardDialog.java

@@ -40,7 +40,7 @@ public class CreateDefaultRegattaLeaderboardDialog extends AbstractCancelableDia
 
     protected void ok() {
         RegattaIdentifier regattaIdentifier = new RegattaName(regatta.getName());
-        sailingService.createRegattaLeaderboard(regattaIdentifier, regatta.getName(), new int[]{},
+        sailingService.createRegattaLeaderboard(regattaIdentifier, /* displayName */ null, new int[]{},
                 new AsyncCallback<StrippedLeaderboardDTO>() {
             @Override
             public void onFailure(Throwable t) {