Summary
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Currently, duplicating a journal results in the new journal's mail alias
name overwriting the original's.
Steps to reproduce
------------------
* install `account_accountant`
* duplicate the "Vendor Bills" journal
=> you should see that the alias name of the new journal overwrites the
alias of the original journal.
Cause
-----
When duplicating a journal, the new journal inherits the alias of the
original. Because of this, a specific code segment intended to generate
missing aliases for new sale/purchase journals, inadvertently modifies
the name of the alias.
opw-3597349
closesodoo/odoo#143771
Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>