Landscape Grass scale not applied when min and max are same value

If min and max scale are the same in a LandscapeGrassType asset, scale will not be applied.

Confirmed in 4.25 MAIN @ CL 11318998

4.23 Sample project with basic landscape grass attached.

1. Create a landscape
2. Create and Implement a 'Landscape Grass Type' https://docs.unrealengine.com/en-US/Engine/OpenWorldTools/Grass/QuickStart/index.html
3. In Landscape Grass Type asset, change Scale X

Result: Scale will be reflected if min and max are not the same. If min and max are the same, the scale will default to 1