Landscape Grass Type will not build with static lighting leaving 'Lighting needs to be rebuilt warning.'

When using the Landscape Grass Type and using a Static or Stationary light will throw the 'Lighting needs to be rebuilt' warning.

1. Open UE4
2. Setup a Landscape Grass Type with a Material applied to a Landscape (https://docs.unrealengine.com/latest/INT/Engine/OpenWorldTools/Grass/QuickStart/index.html)
3. Use a simple shape mesh like the Cone, Box, or Sphere.
4. Set the Landscape Grass Type to a low density like 10
5. Hit the Build button in the Toolbar
6. After Built press Play in the Toolbar

Results: Lighting will not be built for the landscape grass type.

Expected: Lighting would be built, or at the very least the meshes with this should not cause a warning to appear that lighting needs to be rebuilt for projects using any static lighting.

Fix UE-51650

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