Fix UnbundledProductApp test to allow extendend public libraries. am: 5af718b8bc am: 86c719c612 am: 9b27e778b9 am: 57fe0c56d6

Original change: https://android-review.googlesource.com/c/platform/art/+/2194871

Change-Id: Icdbbc03ed6021f3e41a2b55b06c9bed651e6c3f3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>