Merge "Revert "Add WALLPAPER_PICKER_GRID_APPLY_BUTTON to SysUi Flags.kt"" into udc-qpr-dev am: dea4d8e359

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/24379315

Change-Id: I8fcb314566e3fd40c1c00faf5f9522437e9afc90
Signed-off-by: Automerger Merge Worker <[email protected]>