test(forms): update test name with correct wording (#21833)

Use the term primitive value instead of standalone

Fixes #21831

PR Close #21833

packages/forms/test/form_builder_spec.ts

@@ -42,7 +42,7 @@ import {of } from 'rxjs/observable/of';
       expect(g.controls['password'].asyncValidator).toEqual(asyncValidator);
     });
 
-    it('should use controls whose form state is a standalone value', () => {
+    it('should use controls whose form state is a primitive value', () => {
       const g = b.group({'login': b.control('some value', syncValidator, asyncValidator)});
 
       expect(g.controls['login'].value).toEqual('some value');