Revert "folder_branch_ops: turn off block archiving"
Revert "folder_branch_ops: turn off block archiving"

This reverts commit 78efa8977049b951ec3a24120ca3510238d41545.

Issue: KBFS-641

keybase/kbfs,keybase/kbfs,keybase/client,keybase/client,keybase/kbfs,keybase/client,keybase/client,keybase/kbfs,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client