HDRenderLoop: Change struct TextureSettings to class + fix issue with single pass

Assets/ScriptableRenderLoop/HDRenderLoop/Editor/HDRenderLoopInspector.cs

                 EditorGUI.indentLevel++;
                 EditorGUI.BeginChangeCheck();
 
-                tilePass.debugViewTilesFlags = EditorGUILayout.MaskField("DebugView Tiles", tilePass.debugViewTilesFlags, styles.tileLightLoopDebugTileFlagStrings);
-                tilePass.enableSplitLightEvaluation = EditorGUILayout.Toggle(styles.splitLightEvaluation, tilePass.enableSplitLightEvaluation);
-                tilePass.disableTileAndCluster = EditorGUILayout.Toggle(styles.disableTileAndCluster, tilePass.disableTileAndCluster);
-                    // If something is chanage on tilePassLightLoop we need to force a OnValidate() OnHDRenderLoop, else change Rebuild() will not be call
+                    // If something is chanage regarding tile/cluster rendering we need to force a OnValidate() OnHDRenderLoop, else change Rebuild() will not be call
+                }
+
+                EditorGUI.BeginChangeCheck();
+
+                tilePass.debugViewTilesFlags = EditorGUILayout.MaskField("DebugView Tiles", tilePass.debugViewTilesFlags, styles.tileLightLoopDebugTileFlagStrings);
+                tilePass.enableSplitLightEvaluation = EditorGUILayout.Toggle(styles.splitLightEvaluation, tilePass.enableSplitLightEvaluation);
+                tilePass.disableTileAndCluster = EditorGUILayout.Toggle(styles.disableTileAndCluster, tilePass.disableTileAndCluster);
+
+                if (EditorGUI.EndChangeCheck())
+                {
+                    EditorUtility.SetDirty(renderLoop); // Repaint
+                    UnityEditorInternal.InternalEditorUtility.RepaintAllViews();
                 }
                 EditorGUI.indentLevel--;
             }

Assets/ScriptableRenderLoop/HDRenderLoop/Lighting/TilePass/TilePass.cs

                 m_DebugViewTilesMaterial = Utilities.CreateEngineMaterial("Hidden/HDRenderLoop/DebugViewTiles");
 
                 m_SingleDeferredMaterial = Utilities.CreateEngineMaterial("Hidden/HDRenderLoop/Deferred");
-                m_DeferredAllMaterial.EnableKeyword("LIGHTLOOP_SINGLE_PASS");
+                m_SingleDeferredMaterial.EnableKeyword("LIGHTLOOP_SINGLE_PASS");
             }
 
             public override void Cleanup()

Assets/ScriptableRenderLoop/common/TextureSettings.cs

 namespace UnityEngine.Experimental.ScriptableRenderLoop
 {
     [System.Serializable]
-    public struct TextureSettings
+    public class TextureSettings
     {
         public int spotCookieSize;
         public int pointCookieSize;