[ios] Re-enable test testAccessibilityOfBlockPopupSettings on iOS26

The test to close the settings menu was clicking twice back and then it
was clicking on done. This works also by clicking only once on back and
then on done. In this second case the test is passing on iOS26.

Fixed: 444168578
Change-Id: Idb1776f5504204704451190356735cc81d4515f1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6997953
Auto-Submit: Federica Germinario <fedegermi@google.com>
Commit-Queue: Nohemi Fernandez <fernandex@google.com>
Reviewed-by: Nohemi Fernandez <fernandex@google.com>
Cr-Commit-Position: refs/heads/main@{#1522914}