btrfs: Remove fs_info from insert_extent_data_ref

This function is always called with a valid transaction handle from
where fs_info can be referenced. So remove the redundant argument.
No functional changes.

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