Merge "Explicitly set mAllowGoingDown = false when only up is allowed" into sc-dev am: 2b93dbb0b8

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14444776

Change-Id: I068e414ea83d67f2672a04f5ca2a8441c6cb0840