cow estimator: terminate on bad write am: 0b735f6cd2 am: e5585872b8

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/3026185

Change-Id: I8dd4ecbd98a50e0999a515807a5af36fd0fc2d21
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>