[FIX] product_extended: bom_count field in product template view

To apply this domain ('bom_count', '=', 0) in the product template view,
the field bom_count must be in the view.

opw:679095

addons/product_extended/product_extended_view.xml

@@ -9,6 +9,7 @@
             <field name="groups_id" eval="[(4, ref('mrp.group_mrp_user'))]"/>
             <field name="arch" type="xml">
                 <div name="standard_price_uom" position="after">
+                    <field name="bom_count" invisible="1"/>
                     <button name="%(action_view_compute_price_wizard)d"
                         string="Compute from BOM" type="action" 
                         attrs="{'invisible': ['|', ('cost_method', '!=', 'standard'), ('bom_count', '=', 0)]}"