Fix contract terminate user reason table reference
CHANGELOG:
### Fixed
- [#622](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/622) Fix contract terminate user reason table reference
Related card: https://trello.com/c/nqM05yX7/952-fix-motius-finalitzaci%C3%B3-contracte-per-canvi-titular
Edited by Pelayo García