[FIX] stock: multi-company rule for stock.quant.

`stock.move` & `stock.product` have multi-company rules.
There is therefore no reason why `stock.quant` could not have one.

Besides, this could lead to access rights issues,
when a user went to the `Quants` list,
in Warehouse > Traceability > Quants,
while there were quants for products in a company different
than the user company.

opw-653188

addons/stock/security/stock_security.xml

@@ -80,6 +80,13 @@
         <field name="domain_force">['|',('company_id','=',False),('company_id','child_of',[user.company_id.id])]</field>
      </record>
 
+    <record model="ir.rule" id="stock_quant_rule">
+        <field name="name">stock_quant multi-company</field>
+        <field name="model_id" ref="model_stock_quant"/>
+        <field name="global" eval="True"/>
+        <field name="domain_force">['|',('company_id','=',False),('company_id','child_of',[user.company_id.id])]</field>
+    </record>
+
     <record model="ir.rule" id="stock_inventory_line_comp_rule">
         <field name="name">Inventory Line multi-company</field>
         <field name="model_id" ref="model_stock_inventory_line"/>