Merge "Explicitly set mAllowGoingDown = false when only up is allowed" into sc-dev am: 2b93dbb0b8 am: 5d365d6e23

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

Change-Id: I81420dd30dd9e3566cd2b5321f10c0a758527bb0