Missed one place to simplify

src/Discord.Net.Rest/Entities/Channels/ChannelHelper.cs

@@ -39,24 +39,6 @@ namespace Discord.Rest
             var args = new TextChannelProperties();
             func(args);
 
-            var overwrites = new List<API.Overwrite>();
-            if (args.UserOverwrites.IsSpecified)
-                overwrites.AddRange(args.UserOverwrites.Value.Select(x => new API.Overwrite()
-                {
-                    TargetId = x.Key,
-                    TargetType = PermissionTarget.User,
-                    Allow = x.Value.AllowValue,
-                    Deny = x.Value.DenyValue,
-                }));
-            if (args.RoleOverwrites.IsSpecified)
-                overwrites.AddRange(args.RoleOverwrites.Value.Select(x => new API.Overwrite()
-                {
-                    TargetId = x.Key,
-                    TargetType = PermissionTarget.Role,
-                    Allow = x.Value.AllowValue,
-                    Deny = x.Value.DenyValue,
-                }));
-
             var apiArgs = new API.Rest.ModifyTextChannelParams
             {
                 Name = args.Name,
@@ -65,7 +47,15 @@ namespace Discord.Rest
                 Topic = args.Topic,
                 IsNsfw = args.IsNsfw,
                 SlowModeInterval = args.SlowModeInterval,
-                Overwrites = overwrites.Count != 0 ? Optional.Create(overwrites.ToArray()) : Optional.Create<API.Overwrite[]>(),
+                Overwrites = args.PermissionOverwrites.IsSpecified
+                    ? args.PermissionOverwrites.Value.Select(overwrite => new API.Overwrite
+                    {
+                        TargetId = overwrite.TargetId,
+                        TargetType = overwrite.TargetType,
+                        Allow = overwrite.Permissions.AllowValue,
+                        Deny = overwrite.Permissions.DenyValue
+                    }).ToArray()
+                    : Optional.Create<API.Overwrite[]>(),
             };
             return await client.ApiClient.ModifyGuildChannelAsync(channel.Id, apiArgs, options).ConfigureAwait(false);
         }