Header preload doesn't take CDN usage into account

[kevinsteffer]

Swift/Swift/Files/Templates/Designs/Swift/Swift_Master.cshtml

Line 161 in 83f19a1

Dynamicweb.Context.Current.Response.AddHeader("link", $"</Files/Templates/Designs/Swift/Assets/css/styles.css?{cssStyleFileInfo.LastWriteTime.Ticks}>; rel=preload; as=style;");