Enable opaque atmospheric scattering for volumetric lighting

ScriptableRenderPipeline/HDRenderPipeline/HDRP/HDRenderPipeline.cs

             visualEnv.PushFogShaderParameters(cmd, m_FrameSettings);
 
             m_SkyManager.RenderSky(hdCamera, m_LightLoop.GetCurrentSunLight(), m_CameraColorBufferRT, m_CameraDepthStencilBufferRT, cmd);
-            if (visualEnv.fogType != FogType.None)
+
+            if (visualEnv.fogType != FogType.None || m_VolumetricLightingPreset != VolumetricLightingPreset.Off)
                 m_SkyManager.RenderOpaqueAtmosphericScattering(cmd);
         }