Always use case insensitive json parsing for api

Jellyfin.Server/Extensions/ApiServiceCollectionExtensions.cs

@@ -232,7 +232,6 @@ namespace Jellyfin.Server.Extensions
                     options.JsonSerializerOptions.WriteIndented = jsonOptions.WriteIndented;
                     options.JsonSerializerOptions.DefaultIgnoreCondition = jsonOptions.DefaultIgnoreCondition;
                     options.JsonSerializerOptions.NumberHandling = jsonOptions.NumberHandling;
-                    options.JsonSerializerOptions.PropertyNameCaseInsensitive = jsonOptions.PropertyNameCaseInsensitive;
 
                     options.JsonSerializerOptions.Converters.Clear();
                     foreach (var converter in jsonOptions.Converters)