Fixed: Multiple Downloaded Episodes Scan commands should not run in parallel

(cherry picked from commit b3d1e4f520d14c41aa6a7dff049ee9b9ef48fecb)

src/NzbDrone.Core/MediaFiles/Commands/DownloadedBooksScanCommand.cs

@@ -9,5 +9,7 @@ namespace NzbDrone.Core.MediaFiles.Commands
         public string Path { get; set; }
         public string DownloadClientId { get; set; }
         public ImportMode ImportMode { get; set; }
+        public override bool RequiresDiskAccess => true;
+        public override bool IsLongRunning => true;
     }
 }