[FIX] website_sale: Missing fields in the product form

When installing ecommerce app in a fresh v12 database
the fields invoice_policy and description_sale were missing in
the product.template view form

opw:1911612

closes odoo#29059

addons/website_sale/views/product_views.xml

@@ -67,6 +67,15 @@
         <field name="inherit_id" ref="product.product_template_form_view"/>
         <field name="arch" type="xml">
             <!-- add state field in header -->
+            <xpath expr="//group[@name='invoicing']" position="attributes">
+                <attribute name="invisible">0</attribute>
+            </xpath>
+            <xpath expr="//group[@name='email_template_and_project']" position="attributes">
+                <attribute name="invisible">0</attribute>
+            </xpath>
+            <xpath expr="//group[@name='description']" position="attributes">
+                <attribute name="invisible">0</attribute>
+            </xpath>
             <xpath expr="//button[@name='toggle_active']" position="before">
                 <button class="oe_stat_button" name="website_publish_button"
                     type="object" icon="fa-globe" attrs="{'invisible': [('sale_ok','=',False)]}">