folder_branch_ops: use `deferLog` in deferred logs
folder_branch_ops: use `deferLog` in deferred logs

To get better line number reporting in the logs.

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