Fix sideload OTA breakage am: 99cbbe7c4c am: b18b1f7694

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/2918733

Change-Id: I8d0bd747c04ddd88d7097a57912f2da299849f47
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>