Translucent materials with tessellation

When using a material with a translucent blend mode, you can not use the lighting modes "Volumetric PerVertex NonDirectional", or "Volumetric PerVertex Directional" and the Tessellation settings "PN Triangles", or "Flat Tesselation" together. Both lighting modes and tessellation can be used separately but print an error when both are used together. The error that is printed is:

Error [SM5] BasePassTessellationShaders.usf(32,3-25): error X3018: invalid subscript 'AmbientLightingVector'

This issue does not appear to be a regression

Versions tested: Issue occurs in all versions tested
4.16.3 - CL: 3561208
4.17.2 - CL: 3658906
4.18P2 - CL: 3660543

1. Create a new project (no template or starter content needed)
2. Create a new material > name it "NewMat" > open
3. Set the blend mode to translucent
4. Set "Lighting mode" to "Volumetric PerVertex NonDirectional", or "Volumetric PerVertex Directional"
5. Set tesselation mode to "PN Triangles", or "Flat Tesselation".
6. Compile blueprint
   Result: An error prints and the material will not compile
   Expected Result: The blueprint compiles

Fix UE-51650

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