IndirectLightingColor and IndirectLightingIntensity won't take effect in Mobile Renderer

After some investigation on BasePassPixelShader.usf and MobileBasePassPixelShader.usf, I found that Mobile Indirect Diffuse lighting missing View.IndirectLightingColorScale.

The document says it will work in mobile renderer without HDR and tonemapperfilm.

https://docs.unrealengine.com/en-US/Platforms/Mobile/PostProcessEffects

Actually it won’t work in mobile.

My pull request for this issue.

https://github.com/EpicGames/UnrealEngine/pull/4794