Fixing ModelPreload cancelling existing load am: 57d4f748b8 am: d73fa1ef92 am: 83d4b37ff2 am: 0ea3bdc05e

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

Change-Id: I64a88f52be8777295c44fd46180f343e2c7a2e7d