Revert "Improve `dumpsys backup`"

Revert submission 22327091-br-cts-hsum

Reason for revert: DroidMonitor-triggered revert due to breakage https://android-build.googleplex.com/builds/quarterdeck?branch=git_udc-dev&target=aosp_bramble-userdebug&lkgb=10098913&lkbb=10101009&fkbb=10098962, bug 281753581.

Bug: 281753581

Reverted changes: /q/submissionid:22327091-br-cts-hsum

Change-Id: Ib2c525d2a5ce25a5bd852dfd3539bb72ce5869a3