Unlit view is affected by Exposure Compensation when enabled by post process volume

Unlit view is affected by Exposure Compensation when enabled by post process volume. This will also carry across the other debug views. 

Working as expected in 4.18 CL# 3832480

Found in  4.19 CL# 4033788, 4.20p1 CL# 4112139, 4.21 CL# 4115885

This is a regression.

1. Open the editor
2. Add a post process volume to you scene
3. Enable infinite extent
4. Enable exposure compensation and set it to 4
5. Set the view port to unlit

Results:
The unlit mode will still be affected by the exposure settings

Expected:
Unlit mode would display as normal and unaffected by exposure settings

Current work around: 
Disable game settings under the view menu in the exposure section