MediaCategoryViewController: Rename subcategory to category

Sources/MediaCategories/MediaCategoryViewController.swift

@@ -164,7 +164,7 @@ class VLCMediaCategoryViewController<T>: UICollectionViewController, UICollectio
                 playlistCell.mediaObject = mediaObject
             }
 
-            if let media = subcategory.files[indexPath.row] as? VLCMLMedia {
+            if let media = category.files[indexPath.row] as? VLCMLMedia {
                 playlistCell.media = media
                 if media.mainFile() == nil {
                     playlistCell.media = nil