Stop iterating in exitDuplicate() after having removed a player

This fixes a crash due to the invalidated iterator continuing to loop.
It should be safe to assume there's only ever one duplicate/stale player.

Also updated tdata.

src/PlayerManager.cpp

@@ -918,6 +918,7 @@ void PlayerManager::exitDuplicate(int accountId) {
 
             sock->kill();
             CNShardServer::_killConnection(sock);
+            break;
         }
     }
 }