Unknown hit policy: UNIQUE COUNT caused by DMN-editor

Since the new look-and-feel of the decision table, introduced in the Kogito-bundle version v0.28.2, it is possible to update the hit policy. If for whatever reason the hit policy `COLLECT` is chosen, and one of the collect aggregations (e.g. `COUNT`) are chosen, and afterwards another hit policy is chosen, then the collect count should be removed from the .xml part. Currently it remains, triggering the following error message: