Merge "Revert "Default shell_starting_surface to true to match platform behavior."" into sc-dev am: 874a389c05

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14233343

Change-Id: I6d388d322d3e3ab373d3412d8d2e402bec810f41