fixes specs

spec/features/valuation/budget_investments_spec.rb

@@ -55,6 +55,8 @@ 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)