Update qa locator reference due to renaming

qa/qa/page/component/design_management.rb

@@ -64,7 +64,7 @@ module QA
           # It doesn't work as a CSS selector.
           # So instead we use the name attribute as a locator
           within_element(:design_dropzone_content) do
-            page.attach_file("design_file", design_file_path, make_visible: { display: 'block' })
+            page.attach_file("upload_file", design_file_path, make_visible: { display: 'block' })
           end
 
           filename = ::File.basename(design_file_path)