Fix build from PR merging

MediaBrowser.Controller/Entities/BaseItem.cs

@@ -13,6 +13,7 @@ using System.Threading.Tasks;
 using Diacritics.Extensions;
 using Jellyfin.Data.Entities;
 using Jellyfin.Data.Enums;
+using Jellyfin.Extensions;
 using MediaBrowser.Common.Extensions;
 using MediaBrowser.Controller.Channels;
 using MediaBrowser.Controller.Configuration;