Update keyword in upgraded script for decal

com.unity.render-pipelines.high-definition/HDRP/Editor/Upgraders/UpgradeMenuItem.cs

                         float enableDecal = float.Parse(sub);
                         mat.SetFloat("_SupportDecals", enableDecal);
 
+                        // Decal need to also update keywords _DISABLE_DECALS
+                        HDEditorUtils.ResetMaterialKeywords(mat);
+
                         dirty = true;
                     }
                 }
         }
-
 
         static void UpdateMaterialFile_Decals_2(string path)
         {
             finally
             {
                 EditorUtility.ClearProgressBar();
-                // No need to save in this case
+                // Save all dirty assets
             }
         }
 
             UpdateMaterialToNewerVersion("(EmissiveColor_1)", 1.0f, UpdateMaterial_EmissiveColor_1, UpdateMaterialFile_EmissiveColor_1);
             UpdateMaterialToNewerVersion("(Decals_2)", 2.0f, UpdateMaterial_Decals_2, UpdateMaterialFile_Decals_2);
 
-            // Caution: Version of latest script and default version in all HDRP shader must match
+            // Caution: Version of latest script and default version in all HDRP shader must match 
         }
     }
 }