Fixing ModelPreload cancelling existing load am: 57d4f748b8 am: 90c6b6a19f am: ce5d91df28

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

Change-Id: I7aa6aa7c376fcaaf64ad17e346102f88c1283c83