Out-of-date paged results when changing search

[johngrimes]

Expected behaviour

When I perform a multi-page search and page through some results, then change the search and page again, I expect the results to be from the second search, not the first.

Actual behaviour

Results past the first page are being held over when scrolling down on a subsequent search.

Steps to reproduce

• Open the advanced search.
• Search for all TPPs made active from May 1-31.
• Scroll down to retrieve some pages of results.
• Change the search to all TPUUs made active from May 1-31.
• Scroll down to retrieve some pages of results.
• Observe that TPPs from the original search are shown.

Environment

• Chrome 68.0.3440.17