Update the IllustrationPreference of SettingsLib.

- Adjust the frame size of the LottieView. We set the frame height
  to 300dp and set the length of the short side of the screen to
  the width of the frame. In this way, LottieView has a fixed size
  to solve the problem of incorrect illustration spec.
- Set the importantForAccessibility value to noHideDescendants to
  avoid the a11y issue.

Bug: 190807662
Test: robotest and see the UI.
Change-Id: Ib48f9c65e0dfbf36b7ebb70718fa5423c918a7a9