Roman Gorodilov

Fix cast MediaError to C# object

1

If u set video source from attribute and then onerror rised: ``` fail: BlazoredVideo[0] Failed to convert the JSON: {"name":"error","state":{"controls":true,"currentSrc":"https://localhost:5000/asdfa","defaultPlaybackRate":1,"error":{},"networkState":3,"paused":true,"playbackRate":1,"preload":"metadata","src":"https://localhost:5000/asdfa","volume":1}} System.Text.Json.JsonException: The JSON value could not be converted to Blazored.Video.Support.MediaError....