Merge "Revert "Default shell_starting_surface to true to match platform behavior."" into sc-dev am: 874a389c05 am: 652956d292

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

Change-Id: Ia926a291f9ed433935622b088d401bc234a25863