Fix bug where uncompressed files do not get extent info populated am: 56c70698b3

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/2105504

Change-Id: I14a6692de47bc8a380e890e89bdc71dc68fb7518
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>