Add address,city to broadband contracts tree view

CHANGELOG:

### ADDED
- [#841](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/841) Add address,city to broadband contracts tree view

Related card: https://trello.com/c/Hj23kGzP/1311-afegir-columna-adre%C3%A7a-de-servei-a-la-vista-tree-dels-contractes-ba

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