personalization: rename ambient preview container classname

Class name `zero-state-disabled` means `ambient-mode-enabled`.

BUG=None
TEST=Manually

Change-Id: I707bc380f4c5781b879f9ccdaca9d29b2f7369f3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4563062


Reviewed-by: Jason Thai <jasontt@chromium.org>
Commit-Queue: Jerry Liu <pzliu@google.com>
Cr-Commit-Position: refs/heads/main@{#1149415}