chore(jsp): Fix error with let in porlet (#29843)

### Parent Issue
#29619

### Proposed Changes
* Fix css error with flex in jsp

### Checklist
- [x] Tests
- [x] Translations
- [x] Security Implications Contemplated (add notes if applicable)

### Screenshots
Original             |  Updated
:-------------------------:|:-------------------------:
![localhost_8080_dotAdmin_
(3)](https://github.com/user-attachments/assets/274305b7-d0fc-4b0c-925d-1900b5cbf4e3)
| ![localhost_8080_dotAdmin_
(4)](https://github.com/user-attachments/assets/9996fb4d-800b-475a-b4c9-f718c0b872a1)