Encounter Performed Cat I template uses the wrong value set for transfers

[eedrummer]

When generating QRDA Cat I, the value set for the overall encounter is passed in to the code_display method for transfer from and transfer to. This causes problems on CQMs like CMS188 because the transfer value sets do not overlap with the encounter value set. This causes the code_display method to null flavor the code even if it is not part of the encounter value set.