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: I562f118afcaaa8bb8ce080e67fd8d8a5af08c717