Make digital matches checkbox filter search results on click

[HaSistrunk]

My expectation for the ‘show only results with digital matches’ checkbox on the search results page would be that clicking it would have the effect of filtering the results, rather than needing to re-click the search button to apply. We will definitely test this with users, but if it's not too much of a lift before testing, let's implement that functionality before testing.

Additional context

This would mean that the checkbox would be operating differently on the homepage v. the search results page, so that's also a consideration.