If a pin is added to a node and then split only one of the pins can be removed

If a user adds a Vector+Vector node, adds a pin, Splits the new pin, and then removes a pin the option to remove the other two remaining pins is not available.

1. Open editor
2. Open Level blueprint
3. Add a Vector+Vector Node
   Right Click event graph > Type Vector + Vector
4. Add a new pin to the Vector+Vector node via the Add pin + button
5. Split the new pin
   Right click the new pin > Split pin
6. Remove the one of the new float pins
   Right click float pin > Remove pin
7. Try to remove another of the new pins
8. Notice you cannot remove the other two new pins

[4.6.1] Remove pin on split struct