ItEr58S14RecalculosConexionEscenariosItEr57S15: [Bug #465] Fix bug.

The condition was wrong. When the tasks are not preexistent the tasks cannot be removed

navalplanner-business/src/main/java/org/navalplanner/business/orders/entities/TaskSource.java

@@ -144,7 +144,7 @@ public class TaskSource extends BaseEntity {
         @Override
         public TaskElement apply(ITaskSourceDAO taskSourceDAO,
                 boolean preexistent) {
-            if (!preexistent) {
+            if (preexistent) {
                 for (TaskSource each : toBeRemovedFromBottomToTop) {
                     remove(taskSourceDAO, each);
                 }