Remove duplicate test

This test is exactly the same as the "visible for admins" scenario.

spec/features/valuation/budget_investments_spec.rb

@@ -283,23 +283,6 @@
  visit valuation_budget_budget_investment_path(budget, investment)
  end.to raise_error "Not Found"
  end
-
- scenario "preview is visible" do
- logout
- login_as create(:administrator).user
-
- visit valuation_budget_budget_investment_path(budget, investment)
-
- expect(page).to have_content("Investment preview")
- expect(page).to have_content(investment.title)
- expect(page).to have_content(investment.description)
- expect(page).to have_content(investment.author.name)
- expect(page).to have_content(investment.heading.name)
- expect(page).to have_content("1234")
- expect(page).to have_content("Unfeasible")
- expect(page).to have_content("It is impossible")
- expect(page).to have_content("Ana ([email protected])")
- end
  end
 
  describe "Valuate" do