fix: Parsing IQDB correctly

[Nachtalb]

Fixes IQDB result parsing as well as simplify it.

[package]
name = "iqdbtest"
version = "0.1.0"
edition = "2024"

[dependencies]
sauce-api = { version = "1.2.0", path = "../../github.com/lyssieth/sauce-api", features = [
  "iqdb",
  "rustls",
] }
tokio = { version = "1.48.0", features = ["macros", "rt-multi-thread"] }

use sauce_api::error::Error;
use sauce_api::source::{Output, Source, iqdb::Iqdb};

async fn find_source(url: &str) {
    let source = Iqdb::create(()).await.unwrap();
    let res: Result<Output, Error> = source.check(url).await; // Can take some time as IQDB is a bit slow.

    match res {
        Ok(result) => {
            println!("Found results! {:?}", result);
        }
        Err(e) => {
            eprintln!("Unable to find results: {}", e);
        }
    }
}

#[tokio::main]
async fn main() {
    find_source("https://cdn.donmai.us/original/ed/1e/ed1e6e777cf15e42b05f9accf4b28e8c.jpg").await;
}

Returns:
Found results! Output { original_url: "https://cdn.donmai.us/original/ed/1e/ed1e6e777cf15e42b05f9accf4b28e8c.jpg", items: [Item { link: "https://danbooru.donmai.us/posts/9213656", similarity: 0.95 }, Item { link: "https://danbooru.donmai.us/posts/7756900", similarity: 0.61 }, Item { link: "https://danbooru.donmai.us/posts/10077559", similarity: 0.49 }] }

[lyssieth]

Looks sane to me; will merge in a bit.