Simplify metadata subdir check

MediaBrowser.LocalMetadata/Images/EpisodeLocalImageProvider.cs

@@ -42,10 +42,10 @@ namespace MediaBrowser.LocalMetadata.Images
 
             var images = GetImageFilesFromFolder(nameWithoutExtension, parentPathFiles);
 
-            var metadataSubPath = directoryService.GetDirectories(parentPath).Where(d => d.Name.EndsWith("metadata", StringComparison.OrdinalIgnoreCase)).ToList();
-            foreach (var path in metadataSubPath)
+            var metadataSubDir = directoryService.GetDirectories(parentPath).FirstOrDefault(d => d.Name.Equals("metadata", StringComparison.Ordinal));
+            if (metadataSubDir is not null)
             {
-                var files = directoryService.GetFiles(path.FullName);
+                var files = directoryService.GetFiles(metadataSubDir.FullName);
                 images.AddRange(GetImageFilesFromFolder(nameWithoutExtension, files));
             }