Merge "Constraint Snackbar's width to 504dp" into sc-v2-dev am: 3013c7ecf5 am: c0f7659683

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/16388221

Change-Id: I91594935a8e2823b7116fc649581be04160b8295