Update DlnaManager.cs

Fix for #4060

Emby.Dlna/DlnaManager.cs

@@ -220,7 +220,7 @@ namespace Emby.Dlna
         {
             try
             {
-                return Regex.IsMatch(input, pattern);
+                return Regex.IsMatch(input, pattern, RegexOptions.IgnoreCase | RegexOptions.CultureInvariant) || input.Contains(pattern, StringComparison.OrdinalIgnoreCase);
             }
             catch (ArgumentException ex)
             {