Before this commit the only way to modify the domain is to completely override portal_my_invoices.
Since this function is so big this is not clean/easy to do.
By creating a separate function we can simply override it and we can reuse the function on two places.

closes odoo/odoo#77818

X-original-commit: b7effc442cd7ff47e00718adf5b1af43e9f326ee
Signed-off-by: Florian Gilbert <[email protected]>