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

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

Change-Id: Iefabef9b58afbcac6248c008a492ac574e4d00c7