new file is added when syncing playlist in folder.

[jundoll]

new file is added when syncing playlist in folder.

〇before sync playlistA in game
Beat Saber
　└ Playlists
　　└ FolderX
　　　└ playlistA

〇after
Beat Saber
　└ Playlists
　　└ FolderX
　　　└ playlistA (←not updated)
　　└ playlistA (←new)