folder_block_ops: move clearing defer vars together for clarity
folder_block_ops: move clearing defer vars together for clarity

Suggested by jzila.

Issue: #17534

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