Revert "CrOS Settings: Enable the Settings revamp feature flag by default"

This reverts commit 03eeee5f.

Reason for revert: b/317943159 (also b/325998223)

Original change's description:
> CrOS Settings: Enable the Settings revamp feature flag by default
>
> Enables the OsSettingsRevampWayfinding feature flag by default and
> removes the corresponding field trial test config entry.
>
> Bug: b/325649023
> Test: browser_tests --gtest_filter="OSSettings*"
> Change-Id: Ic19553cf11acf5f8460f101c6e35d60762f18020
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5303999


> Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
> Commit-Queue: Wes Okuhara <wesokuhara@google.com>
> Cr-Commit-Position: refs/heads/main@{#1261879}

Bug: b/325649023
Change-Id: Idda4d1b60ed4c9f42ba1f92d5ceb7111422bc5c8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5307458


Reviewed-by: Pi-Hsun Shih <pihsun@chromium.org>
Reviewed-by: David Munro <davidmunro@google.com>
Commit-Queue: Pi-Hsun Shih <pihsun@chromium.org>
Auto-Submit: David Munro <davidmunro@google.com>
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1262581}