Remove the search_customer filter in ResPartner _name_search

CHANGELOG:

### Fixed
- [#745](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/745) Fix Partner name search to don't filter the providers.

Related card: https://trello.com/c/9qDP8aje/1112-per-conciliar-moviment-extracte-bancari-amb-prove%C3%AFdor-cal-que-sigui-client

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