fix(e2e): align a11y test beforeEach with established pattern

Use `waitUntil: 'networkidle'` and trailing-slash URL regex to match
the pattern applied to other e2e tests in ff83076.

Signed-off-by: Peter Ringelmann <peter.ringelmann@nextcloud.com>

Author: pringelmann

playwright/e2e/a11y-question-inputs.spec.ts

@@ -14,8 +14,8 @@ import { QuestionType } from '../support/sections/QuestionType'
 const test = mergeTests(randomUserTest, appNavigationTest, formTest, topBarTest)
 
 test.beforeEach(async ({ page }) => {
-	await page.goto('apps/forms')
-	await page.waitForURL(/apps\/forms$/)
+	await page.goto('apps/forms', { waitUntil: 'networkidle' })
+	await page.waitForURL(/apps\/forms\/$/)
 })
 
 test.describe('Accessibility: aria attributes on question inputs', () => {