[Bug]: Cancel shuttle verb does not cancel shuttle

### BYOND Version

515.1647

### Round Date

2025/08/14

### Round ID

53519

### Test merges

_No response_

### Describe the bug

<img width="609" height="583" alt="Image" src="https://github.com/user-attachments/assets/e8bfa7e8-8a64-4d9d-8c37-a13219228bdb" />

### What did you expect?

button should work

### Reproducible steps

use the shuttle cancel verb after it has been called by vote