Update DangerDialog test call to Window#resize

Author: myabc

test/system/open_project/danger_dialog_test.rb

@@ -66,7 +66,7 @@ def test_submit_button_submits_form
 
   def test_buttons_visible_without_scrolling_with_form
     visit_preview(:with_form_long_additional_details_test, route_format: :json)
-    window.resize(width: window.viewport_size[0], height: 250)
+    window.resize(height: 250)
 
     click_button("Click me")