Disables flaky test am: 2443af6d8a

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/ThemePicker/+/21534072

Change-Id: Ia84b1fe0b40c66a1865998337702381c45e26659
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>