Merge pull request #1314 from Unity-Technologies/volumetric-lighting-updates

Refresh atlas on volume deletion

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Lighting/Volumetrics/DensityVolumeManager.cs

             {
                 volumeAtlas.RemoveTexture(volume.parameters.volumeMask);
             }
+
+            //Upon removal we have to refresh the texture list.
+            TriggerVolumeAtlasRefresh();
         }
         
         public DensityVolume[] PrepareDensityVolumeData(CommandBuffer cmd)