Fix map_or calling function.

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

src/api/client/context.rs

@@ -132,7 +132,7 @@ pub(crate) async fn get_context_route(
 	let state_at = events_after
 		.last()
 		.map(ref_at!(1))
-		.map_or(body.event_id.as_ref(), |pdu| pdu.event_id.as_ref());
+		.map_or_else(|| body.event_id.as_ref(), |pdu| pdu.event_id.as_ref());
 
 	let state_ids = services
 		.rooms