Use check mark to indicate the applied wallpaper am: 369e082d73 am: 0bc2be1291 am: c01f9d9d38

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/WallpaperPicker2/+/15155680

Change-Id: I126927392823bcd0b92240d66a1f268eb7ead54c