When paginating the sort option is lost

Every usage of `pagination` removes `&sort=...` part of a query, so datasets are sorted in default order.

E.g., visit https://www.opendata.dk/search and select sort option other than default one:

https://www.opendata.dk/search?q=&sort=views_recent%3Adesc

Next, try to go to page 2 and see that queries are lost.