Adds migration back for v9 for #10450 (#11769)

src/Umbraco.Infrastructure/Migrations/Upgrade/UmbracoPlan.cs

@@ -267,7 +267,7 @@ protected void DefinePlan()
 
             // TO 9.2.0
             To<AddUserGroup2NodeTable>("{0571C395-8F0B-44E9-8E3F-47BDD08D817B}");
-
+            To<AddDefaultForNotificationsToggle>("{AD3D3B7F-8E74-45A4-85DB-7FFAD57F9243}");
         }
     }
 }

src/Umbraco.Infrastructure/Migrations/Upgrade/V_9_2_0/AddDefaultForNotificationsToggle.cs

@@ -0,0 +1,17 @@
+using Umbraco.Cms.Core;
+
+namespace Umbraco.Cms.Infrastructure.Migrations.Upgrade.V_9_2_0
+{
+    public class AddDefaultForNotificationsToggle : MigrationBase
+    {
+        public AddDefaultForNotificationsToggle(IMigrationContext context)
+            : base(context)
+        { }
+
+        protected override void Migrate()
+        {
+            var updateSQL = Sql($"UPDATE {Constants.DatabaseSchema.Tables.UserGroup} SET userGroupDefaultPermissions = userGroupDefaultPermissions + 'N' WHERE userGroupAlias IN ('admin', 'writer', 'editor')");
+            Execute.Sql(updateSQL.SQL).Do();
+        }
+    }
+}