Merge "Adjust bottom picker padding / margin & add a drag handle" into sc-dev am: 5e94a5fa8f

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/13916400

Change-Id: I65a16f7a82e94b202f0d5af46015c61d586ead6d