Output Pins Not deleting on DoOnce MultiInput

When using the DoOnce MultiInput node in blueprints, deleting a newly added pin on the input side will not delete its corresponding output pin. Adding a new pin after that will create the result like Screenshot_01 which has been attached.

Regression:
This issue occurs in 4.13.2, 4.14.3, and 4.15.1 Binary builds of the engine

1. Create a new project
2. Create a new actor class blueprint > name it Actor_BP > Open Actor_BP
3. Navigate to Actor_BP's event graph
4. Add a DoOnce MultiInput node
5. Add a new pin
6. Delete the new pin
7. Add a new Pin
   Result: The output pin is not delete
   Expected Result: The output pin is deleted

Fix UE-51650

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