[FIX] account: update default value in alias on journal type change

Steps to reproduce the bug:
- Go to settings and enable “External Email Servers” option
- Go to accounting > Configuration > journals
- Create a new journal, Choose "purchase" type
- save
- Go to advanced settings tab > click on email alias
- Note that default value = `in_invoice`
- Create another journal, choose "Miscellaneous" type > save
- Change the type to "purchase"

Problem:
the default value = "out_invoice", because it is not updated in the write function after changing the journal type
In the case of type == 'purchase', the default value should be 'in_invoice', and in any other case, it should be 'out_invoice'.

opw-2618357

closes odoo/odoo#75358

X-original-commit: 3da57964aeee99c8314195c763fe521c28fbc734
Signed-off-by: William André (wan) <wan@odoo.com>