Fix partial extraction feature in ota_extractor am: 99da2214e4

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/3285445

Change-Id: I845ca1f6cc6d04f379ab9d3154c5a8b2dba2ab37
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>