[FedCM] Update wpt test to always show account chooser
With mediation optional, some tests may not show the account chooser
which might affect certain functions in the tests.
Bug: None
Change-Id: Iaf53657f8b5a43c41157c721774ef828a1b7987f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5905460
Commit-Queue: Yi Gu yigu@chromium.org
Reviewed-by: Christian Biesinger cbiesinger@chromium.org
Cr-Commit-Position: refs/heads/main@{#1363235}