better method to obtain the folderName

src/NzbDrone.Core/Tv/Movie.cs

@@ -5,6 +5,7 @@ using NzbDrone.Common.Extensions;
 using NzbDrone.Core.Datastore;
 using NzbDrone.Core.Profiles;
 using NzbDrone.Core.MediaFiles;
+using System.IO;
 
 namespace NzbDrone.Core.Tv
 {
@@ -54,6 +55,11 @@ namespace NzbDrone.Core.Tv
 
         public bool HasFile => MovieFileId > 0;
 
+        public string FolderName()
+        {
+            return new DirectoryInfo(Path).Name;
+        }
+
         public bool IsAvailable(int delay = 0)
         {
             //the below line is what was used before delay was implemented, could still be used for cases when delay==0