Apply suggestions from code review

Co-authored-by: Alejandro Santiago <dev@alestiago.com>

lib/game/bloc/game_bloc.dart

@@ -44,9 +44,7 @@ class GameBloc extends Bloc<GameEvent, GameState> {
       );
     } else {
       emit(
-        state.copyWith(
+        state.copyWith(activatedBonusLetters: newBonusLetters),
-          activatedBonusLetters: newBonusLetters,
-        ),
       );
     }
   }