Show vodafone_id in Vodafone and Router4G contract form view
CHANGELOG:
### Added
- [#781](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/781) Show vodafone_id in Vodafone and Router4G contract form view.
Related card: https://trello.com/c/8TRrIJMF/1223-contractes-4g-camp-vodafone-id
Edited by Pelayo García