Fix: use sudo() with change tariff run_from_api method
CHANGELOG:
### Fixed
- [#983](https://git.coopdevs.org/coopdevs/som-connexio/odoo-somconnexio/-/merge_requests/983) Use sudo() with change tariff run_from_api method
Related card: https://trello.com/c/vbt4hjWF/1527-revisar-error-contracttariffchangewizardrunfromapi-en-el-codi
Both search method and write belong to the CRUD methods that require permissions that the public user doesn't have by default
Edited by Gerard Funosas