Delay setting night mode to show ripple animation am: e7b91d59f8 am: 8bb4fdc333 am: 2b8c716a63

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/ThemePicker/+/15093525

Change-Id: If92e1d9f7dd7a470cc6e805b450a4362d36f7633