Fixing ModelPreload cancelling existing load am: 57d4f748b8 am: d73fa1ef92 am: a0fda9ad65 am: b169269c68

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15820555

Change-Id: I9183673c702f092d06c5623678b1f5a359fe796f