Ensure Work Package Export scenario awaits dialog

Author: myabc

spec/features/work_packages/export_spec.rb

@@ -208,8 +208,7 @@ def expect_selected_columns(columns = %w[])
     end
 
     it "opens the dialog and exports" do
-      settings_menu.open_and_choose I18n.t("js.toolbar.settings.export")
-      click_on export_type
+      open_export_dialog!
       export!
     end
   end