Fix duplicate verity bug am: b4416c9ade

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/2172124

Change-Id: I68a2c9912495196645e32b175478051bcce93887
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>