fix backdrop images

MediaBrowser.Server.Implementations/Dto/DtoService.cs

@@ -981,7 +981,7 @@ namespace MediaBrowser.Server.Implementations.Dto
                 var screenshotLimit = options.GetImageLimit(ImageType.Screenshot);
                 if (screenshotLimit > 0)
                 {
-                    dto.BackdropImageTags = GetImageTags(item, item.GetImages(ImageType.Screenshot).Take(screenshotLimit).ToList());
+                    dto.ScreenshotImageTags = GetImageTags(item, item.GetImages(ImageType.Screenshot).Take(screenshotLimit).ToList());
                 }
             }