mount: fix "mount_fusefs: -o timeout=: option not supported" on FreeBSD
mount: fix "mount_fusefs: -o timeout=: option not supported" on FreeBSD

Before this change `rclone mount` would give this error on FreeBSD

    mount helper error: mount_fusefs: -o timeout=: option not supported

Because the default value for FreeBSD was set to 15m for
--daemon-timeout and that FreeBSD does not support the timeout option.

This change sets the default for --daemon-timeout to 0 on FreeBSD
which fixes the problem.

Fixes #3610

ncw/rclone,ncw/rclone,ncw/rclone,ncw/rclone