folder_block_ops: remove redundant code in GetDirtyDirChildren
folder_block_ops: remove redundant code in GetDirtyDirChildren

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