Round upward for events_after in /context limit.

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

src/api/client/context.rs

@@ -100,7 +100,7 @@ pub(crate) async fn get_context_route(
 		.ready_filter_map(|item| event_filter(item, filter))
 		.wide_filter_map(|item| ignored_filter(&services, item, sender_user))
 		.wide_filter_map(|item| visibility_filter(&services, item, sender_user))
-		.take(limit / 2)
+		.take(limit.div_ceil(2))
 		.collect();
 
 	let (base_event, events_before, events_after): (_, Vec<_>, Vec<_>) =