[FIX] account: keep the code leading zeros on account duplication

Steps to reproduce:
- install accounting
- go to accounting > configuration > charts of account
- create a chart of account with a code containing leading zero's
(ex: 000022)
- duplicate the previously created chart of account

Previous behavior:
leading zero's are not kept trough duplication

Current behavior:
the new code is padded with leading zero's to keep the same length

opw-2172816

closes odoo/odoo#43802

X-original-commit: c458c8ecee6b544b4056ccf5a9af591622238182
Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>

addons/account/models/account.py

@@ -593,7 +593,7 @@ class AccountAccount(models.Model):
         if default.get('code', False):
             return super(AccountAccount, self).copy(default)
         try:
-            default['code'] = (str(int(self.code) + 10) or '')
+            default['code'] = (str(int(self.code) + 10) or '').zfill(len(self.code))
             default.setdefault('name', _("%s (copy)") % (self.name or ''))
             while self.env['account.account'].search([('code', '=', default['code']),
                                                       ('company_id', '=', default.get('company_id', False) or self.company_id.id)], limit=1):