WebUI cr-checkbox: Default to CR2023 styles

Bug: 326116364
Change-Id: Idb05daefe55f69117c32befe997bea04ffbf3585
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5417054


Reviewed-by: John Lee <johntlee@chromium.org>
Commit-Queue: Teresa Mao <temao@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1282322}