Revert ResetUpdateProgress behavior am: f97848017f

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/2620449

Change-Id: I95e71258ae4694660f11b47840c741182332e579
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>