Remove unnecessary JSON prop

src/Discord.Net.Rest/API/Rest/GetInviteParams.cs

@@ -1,10 +1,7 @@
-using Newtonsoft.Json;
-
 namespace Discord.API.Rest
 {
     internal class GetInviteParams
     {
-        [JsonProperty("with_counts")]
         public Optional<bool?> WithCounts { get; set; }
     }
 }