folder_block_ops: rename local `lState`
folder_block_ops: rename local `lState`

Suggested by jzila.

Issue: #1766

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