[FIX] account: do not copy alias

When duplicating a journal, the alias is kept. Therefore, when the user
tries to change it, it updates the value on both records.

opw-1941717

closes #31242

addons/account/models/account.py

@@ -481,7 +481,7 @@ def _get_bank_statements_available_sources(self):
     post_at_bank_rec = fields.Boolean(string="Post At Bank Reconciliation", help="Whether or not the payments made in this journal should be generated in draft state, so that the related journal entries are only posted when performing bank reconciliation.")
 
     # alias configuration for 'purchase' type journals
-    alias_id = fields.Many2one('mail.alias', string='Alias')
+    alias_id = fields.Many2one('mail.alias', string='Alias', copy=False)
     alias_domain = fields.Char('Alias domain', compute='_compute_alias_domain', default=lambda self: self.env["ir.config_parameter"].sudo().get_param("mail.catchall.domain"))
     alias_name = fields.Char('Alias Name for Vendor Bills', related='alias_id.alias_name', help="It creates draft vendor bill by sending an email.", readonly=False)