Export function to get last timestamp of room

src/stores/room-list/algorithms/tag-sorting/RecentAlgorithm.ts

@@ -62,7 +62,7 @@ export const sortRooms = (rooms: Room[]): Room[] => {
     });
 };
 
-const getLastTs = (r: Room, userId: string): number => {
+export const getLastTs = (r: Room, userId: string): number => {
     const mainTimelineLastTs = ((): number => {
         // Apparently we can have rooms without timelines, at least under testing
         // environments. Just return MAX_INT when this happens.