get start over button to not redirect to the homepage

[dnoneill]

In order to do this it should be pretty simple. You should be able to override the call method here: https://github.com/projectblacklight/blacklight/blob/a8b5a3d3a2e8243c8a875d40528eae5c106d83bd/app/components/blacklight/start_over_button_component.rb#L5-L7 and add the params search_field=all_fields