Changing branch on page with url query doesn't maintain query

For example, the pull request list page has an option to filter by pull state and search by keyword, both of which add a query to the url. There are two issues here:
1. Filtering pull list with refName query in url removes refName query
- go to https://dolthub.awsdev.ld-corp.com/repositories/dolthub/pdap-datasets/pulls?refName=main
- filter by open PRs results in https://dolthub.awsdev.ld-corp.com/repositories/dolthub/pdap-datasets/pulls?filter=open
- should result in https://dolthub.awsdev.ld-corp.com/repositories/dolthub/pdap-datasets/pulls?refName=main&filter=open
2. Changing branch when filter or search is active removes those queries and replaces with refName query
- go to https://dolthub.awsdev.ld-corp.com/repositories/dolthub/pdap-datasets/pulls?filter=open
- changing branch results in https://dolthub.awsdev.ld-corp.com/repositories/dolthub/pdap-datasets/pulls?refName=andy%2Fdedupe
- should result in https://dolthub.awsdev.ld-corp.com/repositories/dolthub/pdap-datasets/pulls?refName=andy%2Fdedupe&filter=open

We should do an audit of other pages that make use of url queries on the database page and make sure both of these cases are handled correctly