Material Parameters aren't unique if the Material Function has been duplicated

Material Parameters aren't unique if the Material Functions has been duplicated, When the parameters are enabled in a Material Instance, one will be disabled on Material Instance close.

This is a regression:

Working in 4.15.3-3450819
Not working in 4.16.2-3514769, Main-3550045

Licensee description:

he material expression and parameter GUIDs aren't made unique when a material function is duplicated. This means if you use both material functions in a material, the parameters are seen as the same in the material instance editor despite having different names.

1. Open the attached test project
2. Open 'NewMaterial_Inst'
3. Enable both parameters in the Vector Parameter Values section
4. Save & close the material instance
5. Reopen 'NewMaterial_Inst'

Results: One of the parameters will be disabled when the instance is reopened

Expected: For all parameters to work regardless if they were created by duplicating the material function

[UE-23848] Bug Status

Fix UE-51650

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