Changing the names of inputs in a collapsed graph can change connected inputs in other collapsed nodes

Changing the names of inputs in a collapsed graph can change connected inputs in other collapsed nodes.

Reproduced in 4.7.2 binary and Main (//depot/UE4/Promotable-CL-2478413)

1. Open any project
2. Open any Blueprint
3. Add a Sequence node
4. Add a Gate node
5. Connect Then 0 to Enter and Then 1 to Open
6. Right-click the Gate node > Collapse Nodes
7. Open the collapsed graph
8. Click the Inputs node
9. In the Details panel, change Enter to Foo and Open to Bar
10. Compile

Result:
The Gate inputs are renamed as well. This causes a compile error.