[FIX] account: show partner in invoice list view

The customers were removed from the invoice list view in
https://github.com/odoo/odoo/commit/317802d69e6236a43b2249b38d2f352813644f20



This was probably because the name of the variables
invoice_vendor_display_name was missleading as it was only for vendors
beofre but also for customers now. So this commit also renames related
variables.
While we are at renaming things, I also renamed the type in variables
supsense -> suspense.

closes odoo/odoo#35531

Signed-off-by: Laurent Smet <smetl@users.noreply.github.com>