btrfs: remove duplicate recording of physical address

Remove the duplicate physical recording of the original write physical
address in case of a single device write.

This duplicated code is most likely present due to a rebase error.

Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>