Feat/remove change tarif logic in change holder wizard

CHANGELOG:

### Changed
- [#1092](https://git.coopdevs.org/coopdevs/som-connexio/odoo-somconnexio/-/merge_requests/1092) removed change tarif logic in change holder wizard

Related card: https://trello.com/c/EsCoRwR2/1648-canvi-de-titular-camp-producte-no-editable

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