Fix issue with capture callback (now includes post processing results) (#3035)

Co-authored-by: sebastienlagarde <sebastien@unity3d.com>

Author: pmavridis

com.unity.render-pipelines.high-definition/CHANGELOG.md

@@ -35,6 +35,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Fixed timing issues with accumulation motion blur
 - Fixed an issue with the frame count management for the volumetric fog (case 1299251).
 - Fixed issue with shadow mask and area lights.
+- Fixed an issue with the capture callback (now includes post processing results).
 
 ### Changed
 - Removed the material pass probe volumes evaluation mode.

com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/HDRenderPipeline.RenderGraph.cs

@@ -276,7 +276,7 @@ void ExecuteWithRenderGraph(RenderRequest           renderRequest,
             // Because of this, we need another blit here to the final render target at the right viewport.
             if (!HDUtils.PostProcessIsFinalPass(hdCamera) || aovRequest.isValid)
             {
-                hdCamera.ExecuteCaptureActions(m_RenderGraph, colorBuffer);
+                hdCamera.ExecuteCaptureActions(m_RenderGraph, postProcessDest);
 
                 postProcessDest = RenderDebug(m_RenderGraph,
                     hdCamera,