folder_block_ops: collapse WriteRange in the syncOp (#695)
folder_block_ops: collapse WriteRange in the syncOp (#695)

Forgot to do this as part of KBFS-1536.
keybase/client,keybase/client,keybase/client,keybase/kbfs,keybase/client,keybase/client,keybase/kbfs,keybase/client,keybase/client,keybase/client,keybase/kbfs,keybase/client,keybase/client,keybase/kbfs,keybase/client,keybase/client