Return the daemon error code when update_engine_sideload finishes am: c240687b7c

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/3477895

Change-Id: Id8dbcddf67097aee82398c3fa799943b52e0c120
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>