Fix another test

Author: benjie

src/type/__tests__/schema-test.ts

@@ -301,10 +301,10 @@ describe('Type System: Schema', () => {
       '__TypeKind',
       '__Field',
       '__InputValue',
+      '__TypeNullability',
       '__EnumValue',
       '__Directive',
       '__DirectiveLocation',
-      '__TypeNullability',
     ]);
 
     // Also check that this order is stable