Adjust the set wallpaper dialog UI

Spec: https://screenshot.googleplex.com/AAdfoXQ6BBv4hmH.png

Result: https://screenshot.googleplex.com/4UCM5Z8AfSTpw8L.png

Bug: 191992780
Test: manual
Change-Id: I09789e1e36bd5e73b6f01bdeb6168f0c9d18ef43
5 files changed