btrfs: scrub: remove root and csum_root arguments from scrub_simple_mirror()

We don't need to pass the roots as arguments, reading them from the
rb-tree is cheap.  Thus there is really not much need to pre-fetch it
and pass it all the way from scrub_stripe().

And we already have more than enough arguments in scrub_simple_mirror()
and scrub_simple_stripe(), it's better to remove them and only grab
those roots in scrub_simple_mirror().

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>