Sort memory when returning to index

**Is your feature request related to a problem? Please describe.**
When sorting the list of collections by AD or KS score, then clicking on a collection, then returning to the index: the sorting order is back to the default alphanumeric ordering.

**Describe the solution you'd like**
A better user interface behavior would be to return to the same ordering that was active before digging down into a specific collection.

Start at the index view and the collection detail navigation, then reproduce the issue by sorting collections by AD or KS score, opening one collection, and returning to the index. Trace where the selected ordering is reset and preserve it across that navigation; done means the previously selected sort order remains active after returning.

Written by the indexing model from the issue text.