[FIX] account: Set newly created template

Before this commit, Creating New Template from "Send Invoice" wizard doesn't update template_id on the Wizard.

In this commit, We write newly created template_id on the wizard.

closes odoo/odoo#42655

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

addons/account/wizard/account_invoice_send.py

@@ -104,6 +104,7 @@ class AccountInvoiceSend(models.TransientModel):
     def save_as_template(self):
         self.ensure_one()
         self.composer_id.save_as_template()
+        self.template_id = self.composer_id.template_id.id
         action = _reopen(self, self.id, self.model, context=self._context)
         action.update({'name': _('Send Invoice')})
         return action