Fix test with __isTypeOf when not needed

Author: eddeee888

packages/plugins/typescript/resolvers/tests/ts-resolvers.config.customDirectives.spec.ts

@@ -62,7 +62,6 @@ describe('customDirectives.sematicNonNull', () => {
         nonNullableListWithNonNullableItemLevel0?: Resolver<Array<ResolversTypes['String']>, ParentType, ContextType>;
         nonNullableListWithNonNullableItemLevel1?: Resolver<Array<ResolversTypes['String']>, ParentType, ContextType>;
         nonNullableListWithNonNullableItemBothLevels?: Resolver<Array<ResolversTypes['String']>, ParentType, ContextType>;
-        __isTypeOf?: IsTypeOfResolverFn<ParentType, ContextType>;
       };
     `);
   });