Fix messagesScanned consistency: use totalScanned from scan results, remove double-counting

Co-authored-by: xCyanGrizzly <53275238+xCyanGrizzly@users.noreply.github.com>

worker/src/tdlib/topics.ts

@@ -245,6 +245,7 @@ export async function getTopicMessages(
   return {
     archives: archives.reverse(),
     photos: photos.reverse(),
+    totalScanned,
   };
 }