[IMP] account: allow switching from credit note to invoice

Currently, the user has access to a "Switch into credit note/refund" but
not the reverse button to go from a credit note/refund to an
invoice/bill. This is now the case.

This is a partial backport of odoo#103427

task-id 3102251

closes odoo/odoo#133497

X-original-commit: 6f9593a
Related: odoo/enterprise#46492
Signed-off-by: Florian Gilbert (flg) <flg@odoo.com>
Signed-off-by: Louis Baudoux (lba) <lba@odoo.com>