Decal creates lighting artifacts on edge of meshes

When using deferred decals there are artifacts that are caused by the emissive color of the decal when viewing the decals from a low angle. These artifacts appear as thin lines on the edges of the mesh. This issue has not been labeled as a regression as this point

Versions Tested:
4.16.3 - CL: 3561208 - Issue Occurs
4.17.1 - CL: 3586342 - Issue Occurs
4.18.0 - CL: 3597901 - Issue Occurs

1. Create a new project (No template or starter content needed)
2. Import the texture provided (ImportTexture.png)
3. Create a material > Name it "Decal_MAT" > and add the imported texture as a sample to the material
4. Set the material to Deferred Decal
5. Set the Blend mode to translucent
6. Set up the material as pictured provided (DecalArtifact_Setup.png)
7. Apply the material, Save it, and close the material
8. In the level duplicate the floor and position so it is above the first floor

Fix UE-51650

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