Tessellation not working properly on Vulkan

When a user launches content examples with -vulkan tessellation will not be working. Everything tessellated will appear as if it has no tessellation. This issue is also occurring in 4.18

Steps:

1. Run <PathToApp>/ContentExamples.exe -vulkan -log -verbose 
2. Open console and type Open Material_Nodes
3. Navigate to example 1.12 Tessellation Multiplier
4. Open console and type Open Material_Properties
5. Navigate to example 1.8 Tessellation

Expected Outcome: Flat Tessellated and PN Triangles box should have many triangles split up on the box, and TessellationMultiplier should have differing amounts of triangles.
Actual Result: All tessellated boxes are the same as the No Tessellation box.

Fix UE-51650

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