[iOS]Use the settings helper

This ensure we require the button is interactible.

I also looked at what other place used `SettingsAccountButton()`
without the settings helper.

Bug: 386196414
Change-Id: I5d1951254839bf1245689b86a7b7c70512f10a5f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6110608
Auto-Submit: Arthur Milchior <arthurmilchior@chromium.org>
Reviewed-by: Jérôme Lebel <jlebel@chromium.org>
Commit-Queue: Arthur Milchior <arthurmilchior@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1400510}