Fix SR created as sponsorship and coop_agreement altogether

CHANGELOG:

### Fix
- [#828](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/828) Fix SR created as sponsorship and coop_agreement altogether

Related card: https://trello.com/c/u7k6J3JP/1307-les-noves-apadrinades-per-conveni-cooperatiu-no-han-de-quedar-tamb%C3%A9-com-a-apadrinades-pel-contacte-cooperatiu

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