test(addons): expect the Host access tab last in the keyboard spec

The host access step added a fourth tab after Sources, so End now
selects Host access. The spec still expected Sources and failed on
every run.

Assisted-by: Claude:claude-sonnet-5-5 playwright

core/http/react-ui/e2e/addons-gallery.spec.js

@@ -698,7 +698,8 @@ test.describe('Add-ons: access, keyboard, layout and language', () => {
     await expect(tab(page, 'Find add-ons')).toHaveAttribute('aria-selected', 'true')
     await expect(page).toHaveURL(/tab=browse/)
     await page.keyboard.press('End')
-    await expect(tab(page, 'Sources')).toHaveAttribute('aria-selected', 'true')
+    // Host access is the last tab for an administrator.
+    await expect(tab(page, 'Host access')).toHaveAttribute('aria-selected', 'true')
     await page.keyboard.press('Home')
     await expect(tab(page, 'Installed')).toHaveAttribute('aria-selected', 'true')
     // The selected tab is the only one in the tab order.