[FIX] payment_mollie_official: add missing hooks

[sswapnesh]

This commits adds

• 'post_init_hook': required to create payment journal
• 'uninstall_hook': required to disable payment acquirer

[Yenthe666]

@odoo-mvds could you please take a look at this one? Every payment provider should on init create the missing journals and on deletion reset the payment provider. See https://github.com/odoo/odoo/blob/14.0/addons/payment_paypal/__manifest__.py as a sample reference.

[odoo-mvds]

Hi,

Thank you for your contribution and for submitting the pull request (PR). We truly appreciate your effort and interest in improving the project.

Best regards,