Ease the way invoice report is selected for rendering.
We now only rely on `_get_name_invoice_report()` to decide
the report, and it is automatically selected in the report template
`report_invoice` that is extended by localizations.
Task-id:3492033
closesodoo/odoo#136389
Related: odoo/enterprise#47812
Signed-off-by: Laurent Smet (las) <las@odoo.com>