Remove package certificate from ContactsIndexerTests am: 2dbc06757c

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/AppSearch/+/17738757

Change-Id: Ia6a6986c9a98ce09f5cfaf228c8a2d43a87581ab
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>