fix FTR test due to chromeless app

Author: pgayvallet

src/core/public/core_app/status/status_app.tsx

@@ -90,7 +90,7 @@ export class StatusApp extends Component<StatusAppProps, StatusAppState> {
     const { build_hash: buildHash, build_number: buildNumber } = version;
 
     return (
-      <EuiPage className="stsPage">
+      <EuiPage className="stsPage" data-test-subj="statusPageRoot">
         <EuiPageBody restrictWidth>
           <ServerStatus name={name} serverState={serverState} />
 

x-pack/test/functional/page_objects/status_page.js

@@ -29,7 +29,7 @@ export function StatusPagePageProvider({ getService, getPageObjects }) {
     async expectStatusPage() {
       return await retry.try(async () => {
         log.debug(`expectStatusPage()`);
-        await find.byCssSelector('[data-test-subj="kibanaChrome"] nav:not(.ng-hide) ', 20000);
+        await find.byCssSelector('[data-test-subj="statusPageRoot"]', 20000);
         const url = await browser.getCurrentUrl();
         expect(url).to.contain(`/status`);
       });