HDRenderPipeline: Fix SSS display with diffuse only display mode

Assets/ScriptableRenderPipeline/HDRenderPipeline/HDRenderPipeline.cs

             m_FilterSubsurfaceScattering.SetVectorArray("_FilterKernels", sssParameters.filterKernels);
             m_FilterSubsurfaceScattering.SetVectorArray("_HalfRcpWeightedVariances", sssParameters.halfRcpWeightedVariances);
             cmd.SetGlobalTexture("_IrradianceSource", m_CameraSubsurfaceBufferRT);
-            Utilities.DrawFullScreen(cmd, m_FilterSubsurfaceScattering, hdCamera,
-                m_CameraFilteringBufferRT, m_CameraDepthStencilBufferRT);
+            Utilities.DrawFullScreen(cmd, m_FilterSubsurfaceScattering, hdCamera, m_CameraFilteringBufferRT, m_CameraDepthStencilBufferRT);
+
+            // when recombining the lighting, we apply albedo. This need to be modified in case of debug display with diffuse lighting only.
+            Utilities.SetKeyword(m_FilterAndCombineSubsurfaceScattering, "DEBUG_DISPLAY", debugDisplaySettings.IsDebugDisplayEnabled());
-            Utilities.DrawFullScreen(cmd, m_FilterAndCombineSubsurfaceScattering, hdCamera,
-                m_CameraColorBufferRT, m_CameraDepthStencilBufferRT);
+            Utilities.DrawFullScreen(cmd, m_FilterAndCombineSubsurfaceScattering, hdCamera, m_CameraColorBufferRT, m_CameraDepthStencilBufferRT);
 
             context.ExecuteCommandBuffer(cmd);
             cmd.Dispose();

Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Resources/CombineSubsurfaceScattering.shader

             #pragma fragment Frag
 
             #pragma multi_compile _ SSS_FILTER_HORIZONTAL_AND_COMBINE
+            #pragma multi_compile _ DEBUG_DISPLAY
 
             //-------------------------------------------------------------------------------------
             // Include
+            #include "../../../Debug/DebugDisplay.hlsl"
+
             #include "../../../ShaderConfig.cs.hlsl"
             #include "../../../ShaderVariables.hlsl"
             #define UNITY_MATERIAL_LIT // Needs to be defined before including Material.hlsl