Merge "Default shell_starting_surface to true to match platform behavior." into sc-dev am: fbea50d807 am: 5e5aa9c05a

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14187099

Change-Id: I6cb78e46203333c697eac1352d4785862a1d0b24