Fix CTE set operation builder end tracking

[Mobe91]

The following scenario should actually throw an exception

CriteriaBuilder<?> cb = ...;

cb.with(MyCte.class)
      .from(Entity1.class)
      .bind("a").select("a")
   .exceptAll()
      .from(Entity2.class)
      .bind("a").select("a")
  .endSet();
cb.end();

end() has to be called on the builder returned by endSet() and not on the original FullSelectCTECriteriaBuilder. Currently, no exception is thrown in this scenario.