Show full address in CU previous address field

CHANGELOG:

### Fix
- [#695](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/695) Show full address instead of just the street in CU `previous_contract_address` field

Related card: https://trello.com/c/jwiEpgIj/913-camps-que-han-dapar%C3%A8ixer-al-nou-ticket-de-cu

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