[ios] Fix test testAddAccountAddressManually on iOS26

This test was failing on iPad on iOS26 because to see the "save" button
if was first required to scroll down.

Fixed: 424167436
Change-Id: I70e62ce5bb0fe14ee5ec1aaf7ead6dc3e25bf408
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6760033
Auto-Submit: Federica Germinario <fedegermi@google.com>
Reviewed-by: Scott Yoder <scottyoder@google.com>
Commit-Queue: Scott Yoder <scottyoder@google.com>
Cr-Commit-Position: refs/heads/main@{#1487540}