Downloaded file column order should be the same as in the preview

[ptbrowne]

In this case it would be good to use the same order as defined for the preview table (shacl#order?). To be done occasionally if it's not a big thing.

Originally posted by @ortnever in #752 (comment)

• As a user, I want the order of columns when I download a data extract should be the same as in the data preview (after the search)