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: I4f8861c9636e1f0e65c5943231a7b6e47b448079