Trailing commas within ignored fields are not ignored

```rust
use serde::Deserialize;

fn main() {
#[derive(Deserialize)]
struct Test {
field1: i64,
}

let mut deserializer = serde_json_lenient::Deserializer::from_str(
r#"
{
"field1": 1,
"field2": [
1,
2,
3,
],
}
"#,
);

deserializer.set_ignore_trailing_commas(true);

let _test = Test::deserialize(&mut deserializer).unwrap();
// let _test = serde_json_lenient::Value::deserialize(&mut deserializer).unwrap();
}
```

It seems like when deserializing directly to a type implementing `serde::Deserialize`, if a field is completely ignored, then the JSON within that ignored field is not properly treated leniently?

In this example, calling `Test::deserialize` will fail with

```
called `Result::unwrap()` on an `Err` value: Error("expected value", line: 8, column: 17)
```

but calling `serde_json_lenient::Value::deserialize` will not.