CrOS Settings: Update account manager URL for secondary account reauth

When the OsSettingsRevampWayfinding feature flag is enabled, the
account manager subpage is up-leveled to the top-level Accounts page.
As such, the path should be updated accordingly under such conditions.

Bug: b:326311639
Change-Id: I4cac6ec596aad8a3cfe86e52fc4c2acb2b70f900
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5335998


Reviewed-by: Anastasiia N <anastasiian@chromium.org>
Commit-Queue: Wes Okuhara <wesokuhara@google.com>
Cr-Commit-Position: refs/heads/main@{#1267443}