Update Jellyfin.Server/Middleware/UrlDecodeQueryFeature.cs

Co-authored-by: Claus Vium <cvium@users.noreply.github.com>

Jellyfin.Server/Middleware/UrlDecodeQueryFeature.cs

@@ -45,7 +45,7 @@ namespace Jellyfin.Server.Middleware
                 }
 
                 // Encoded querystrings have no value, so don't process anything if a value is present.
-                var kvp = value.First();
+                var (key, stringValues) = value.First();
                 if (!string.IsNullOrEmpty(kvp.Value))
                 {
                     _store = value;