fix clippy issue

src/handlers/starboard.rs

@@ -117,7 +117,7 @@ impl SingleMessageHandler {
 			.get_results(&*self.conn.lock().await)?;
 
 		let repost_id: &Option<BigDecimal> =
-			repost_id.get(0).context("Insert of mapping failed")?;
+			repost_id.first().context("Insert of mapping failed")?;
 
 		match repost_id {
 			Some(id) => {