Use Array.Empty instead of list.

Co-authored-by: jp2masa <jp2masa@users.noreply.github.com>

src/Avalonia.Native/ScreenImpl.cs

@@ -39,7 +39,7 @@ namespace Avalonia.Native
                     return result;
                 }
 
-                return new List<Screen>();
+                return Array.Empty<Screen>();
             }
         }