Fixing ModelPreload cancelling existing load am: 57d4f748b8 am: 90c6b6a19f

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

Change-Id: Ia8b7c3c8af44f082d9906fc2e2644e4846d87c4f