Merge "Revert "Draw rounded corners above the taskbar"" into sc-v2-dev am: 6e2d149ac7

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15614359

Change-Id: Ib16ea6a8c019f03f6145aa5f6768606be07b2ef2