refactor(routes): simplify component loading syntax

frontend/src/app/feature/game/dice/dice.component.ts

@@ -24,7 +24,7 @@ type DiceFormGroup = FormGroup<{
   imports: [CommonModule, ReactiveFormsModule],
   templateUrl: './dice.component.html',
 })
-export class DiceComponent implements OnInit {
+export default class DiceComponent implements OnInit {
   private readonly formBuilder = inject(FormBuilder);
   private readonly diceService = inject(DiceService);
   private readonly userService = inject(UserService);