Invoice claim mails sent only to customer

CHANGELOG:

### FIXED
- [#714](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/714) Invoice claim mails sent only to customer

Related card: https://trello.com/c/lHRsPujz/1110-plantilla-de-retorno-ha-recibido-el-correo-el-usuario-que-est%C3%A1-como-comercial

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