removes poltergeist no js_errors driver

spec/features/valuation/budget_investments_spec.rb

@@ -61,8 +61,6 @@ feature 'Valuation budget investments' do
   end
 
   scenario "Index filtering by heading", :js do
-    Capybara.current_driver = :poltergeist_no_js_errors
-
     group = create(:budget_group, budget: @budget)
     heading1 = create(:budget_heading, name: "District 9", group: group)
     heading2 = create(:budget_heading, name: "Down to the river", group: group)