Force `_compute_showed_name` to be executed
CHANGELOG:
### Fixed
- [#413](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/413) Force "showed name" in product to be set and stored in DB.Edited by Pelayo García
CHANGELOG:
### Fixed
- [#413](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/413) Force "showed name" in product to be set and stored in DB.