test(rest): the section-i18n strip control asserts the rendered sections only

The anonymous objectSchema keeps a declared lookup field's definition (the
strip narrows the sections); the control pins what the strip owns.

Claude-Session: https://claude.ai/code/session_01Q9PZ5Pzqcus4woVvTZwWNU
Co-authored-by: Claude <noreply@anthropic.com>

Author: claude

packages/rest/src/public-form-section-i18n.test.ts

@@ -200,7 +200,6 @@ describe('[#23497] GET /forms/:slug — section headings are localized under Acc
         const res = await buildServer(formView()).get('zh-CN');
         expect(section(res, 0).label).toBe(ABOUT_ZH);
         expect(renderedFields(res)).toEqual([['subject'], ['email'], ['status']]);
-        expect(res.body.objectSchema.fields.contact_id).toBeUndefined();
     });
 
     it('CONTROL: the response shape, its top-level label and `Vary` are unchanged, and the stored view is not mutated', async () => {