fix: contract active and finished filters

CHANGELOG:

### Fixed
- [#1030](https://git.coopdevs.org/coopdevs/som-connexio/odoo-somconnexio/-/merge_requests/1030) Fix contract filters.

Related card: https://trello.com/c/mYHo0vsL/481-els-filtres-en-curs-i-finalitzat-de-contractes-no-s%C3%B3n-gaire-funcionals

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