split keys_changed for stronger-type overloads

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

src/api/client/keys.rs

@@ -232,7 +232,7 @@ pub(crate) async fn get_key_changes_route(
 	device_list_updates.extend(
 		services
 			.users
-			.keys_changed(sender_user.as_str(), from, Some(to))
+			.keys_changed(sender_user, from, Some(to))
 			.map(ToOwned::to_owned)
 			.collect::<Vec<_>>()
 			.await,
@@ -244,7 +244,8 @@ pub(crate) async fn get_key_changes_route(
 		device_list_updates.extend(
 			services
 				.users
-				.keys_changed(room_id.as_str(), from, Some(to))
+				.room_keys_changed(room_id, from, Some(to))
+				.map(|(user_id, _)| user_id)
 				.map(ToOwned::to_owned)
 				.collect::<Vec<_>>()
 				.await,