minor auth_chain optimizations/cleanup

Signed-off-by: Jason Volk <jason@zemos.net>

src/api/server/state.rs

@@ -1,4 +1,4 @@
-use std::sync::Arc;
+use std::borrow::Borrow;
 
 use axum::extract::State;
 use conduit::{err, result::LogErr, utils::IterStream, Err, Result};
@@ -63,7 +63,7 @@ pub(crate) async fn get_room_state_route(
 	let auth_chain = services
 		.rooms
 		.auth_chain
-		.event_ids_iter(&body.room_id, vec![Arc::from(&*body.event_id)])
+		.event_ids_iter(&body.room_id, &[body.event_id.borrow()])
 		.await?
 		.map(Ok)
 		.and_then(|id| async move { services.rooms.timeline.get_pdu_json(&id).await })