Further simplify Terms of Service spec

Since system specs are expensive, the standard workflow can be tested in
one "smoke test", as one scenario.

Run time reduced from 5.8s to 4.9s.

spec/system/admin/configuration/terms_of_service_files_spec.rb

@@ -10,7 +10,7 @@ describe "Terms of Service files" do
 
     before { login_as_admin }
 
-    it "can be uploaded" do
+    it "can be uploaded and deleted" do
       visit spree.edit_admin_general_settings_path
       click_link "Terms of Service"
 
@@ -20,15 +20,6 @@ describe "Terms of Service files" do
       click_button "Create Terms of service file"
 
       expect(page).to have_link "Terms of Service"
-      expect(page).to have_link "Delete file"
-    end
-
-    it "can delete the current file" do
-      attachment = File.open(Rails.root.join(test_file_path))
-      file = Rack::Test::UploadedFile.new(attachment, "application/pdf")
-      TermsOfServiceFile.create!(attachment: file)
-
-      visit admin_terms_of_service_files_path
 
       accept_alert { click_link "Delete" }