Fix author in playlist embeds and fix problem with playlists not having high res pictures leading to error.

changed LavalinkPlaylist to ILavallinkPlaylist

TomatenMusicCore/Music/Entitites/ILavalinkPlaylist.cs

@@ -8,7 +8,7 @@ using Lavalink4NET.Player;
 
 namespace TomatenMusic.Music.Entitites
 {
-    public interface LavalinkPlaylist
+    public interface ILavalinkPlaylist
     {
         public string Name { get; }
         public IEnumerable<LavalinkTrack> Tracks { get; }

TomatenMusicCore/Music/Entitites/SpotifyPlaylist.cs

@@ -5,7 +5,7 @@ using System.Text;
 
 namespace TomatenMusic.Music.Entitites
 {
-    public class SpotifyPlaylist : LavalinkPlaylist
+    public class SpotifyPlaylist : ILavalinkPlaylist
     {
         public string Name { get; }
         public IEnumerable<LavalinkTrack> Tracks { get; }

TomatenMusicCore/Music/Entitites/YoutubePlaylist.cs

@@ -9,7 +9,7 @@ using TomatenMusic.Services;
 
 namespace TomatenMusic.Music.Entitites
 {
-    public class YoutubePlaylist : LavalinkPlaylist
+    public class YoutubePlaylist : ILavalinkPlaylist
     {
         public string Name { get; }