Merge "Revert "Revert "Default shell_starting_surface to true to match platform behavior.""" into sc-dev am: 2f8158f259

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14292741

Change-Id: I7523aabd50b074689921550315fc635b510ae67e