Remove start_date in Contract Iban and Partner Email Change wizard
CHANGELOG:
### CHANGED
- [#794](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/794) Remove start_date in Contract Iban and Partner Email Change wizard
Related card: https://trello.com/c/PcqjmJPr/1246-wizard-canvi-iban-treure-camp-data-inicial
Edited by Pelayo García