fully remove opinions of deleted games

backend/src/main.rs

@@ -170,7 +170,12 @@ async fn delete_game(
     {
         let game = games.remove(pos);
 
-        let users = user_list.lock().await;
+        let mut users = user_list.lock().await;
+
+        for person in users.iter_mut() {
+            person.person.opinion.retain_mut(|o| o.title != game.title);
+        }
+
         save_state(&games, &users);
 
         return Some(game);