[FIX] website_sale_secondary_unit: Adjust to upstream changes

As the product.secondary.unit view has been isolated, we have to
inherit from that one.

website_sale_secondary_unit/views/product_secondary_unit_views.xml

@@ -1,12 +1,13 @@
 <?xml version="1.0" encoding="utf-8" ?>
 <!-- Copyright 2019 Tecnativa - Sergio Teruel
+ Copyright 2021 Tecnativa - Pedro M. Baeza
  License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl). -->
 <odoo>
- <record id="product_template_website_publish_form_view" model="ir.ui.view">
- <field name="model">product.template</field>
+ <record id="product_secondary_unit_view_tree" model="ir.ui.view">
+ <field name="model">product.secondary.unit</field>
  <field
  name="inherit_id"
- ref="product_secondary_unit.product_template_form_view"
+ ref="product_secondary_unit.product_secondary_unit_view_tree"
  />
  <field name="arch" type="xml">
  <field name="factor" position="after">