Enable Debug Color is not functional in the DepthOfField sample

[LB-TomaszSerwanski]

Describe the bug Checking the Enabled Debug Color box does not have any effect in the DepthOfField sample.

Please note that the issue occurs both in Windows and Linux.

Please refer to the attached video for more details.

Steps to reproduce Steps to reproduce the behavior:

1. Launch AtomSampleViewerStandalone.exe.
2. Load the DepthOfField sample (Samples -> Features -> DepthOfField).
3. Check the Enabled Debug Color box on the Sidebar.

Expected behavior Debug Colors appear in the sample.

Actual behavior Nothing happens.

Screenshots/Video

https://user-images.githubusercontent.com/86953108/162394798-c10f00c7-647b-4989-bf5b-f912f526c955.mp4

Found in Branch ASV: Stabilization/2205(3efc7e3) O3DE: Stabilization/2205:Installer

Desktop/Device:

• Device: PC
• OS: Windows
• Version 10
• CPU AMD Ryzen 5 3600
• GPU Nvidia RTX 2060 SUPER
• Memory 16GB