das-committee-b port bug

The `das-committee-b` port is the same as `das-committee-a` in sequencer-related config files, maybe the port should be 8876, right?

<img width="916" height="368" alt="Image" src="https://github.com/user-attachments/assets/9a5b6f07-32e6-42c7-9093-a938330a3932" />