Add SK2 to batch editor supported types

Could do it via reflection but ehh

PKHeX.Core/Editing/Bulk/BatchEditing.cs

@@ -20,7 +20,7 @@ namespace PKHeX.Core
             typeof (PB7),
             typeof (PK7), typeof (PK6), typeof (PK5), typeof (PK4), typeof(BK4),
             typeof (PK3), typeof (XK3), typeof (CK3),
-            typeof (PK2), typeof (PK1),
+            typeof (PK2), typeof (SK2), typeof (PK1),
         };
 
         public static readonly string[] CustomProperties = { PROP_LEGAL, PROP_RIBBONS };