btrfs: balance: use term redundancy instead of integrity in message

When balance reduces the number of copies of metadata, it reduces the
redundancy, use the term redundancy instead of integrity.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>