Screen space decals only sample shadow maps to determine attenuation. The light cookie atlas should also be sampled. 

Steps to repro:
# Open attached repro project.
# Enter play mode
# Observe the red paint decals

Expected: Decals only receive light in the same areas that the regular surfaces do

Actual: Decals seem way too bright since the cookies (which mask out a lot of light) are ignored

This goes for both additional lights and main light even though repro project only uses additional lights