[FIX] add fee rate product for admin in demo data

Author: hbrunn

ps_timesheet_invoicing/demo/hr_employee.xml

@@ -1,5 +1,8 @@
 <?xml version="1.0" encoding="utf-8" ?>
 <odoo>
+    <record id="hr.employee_admin" model="hr.employee">
+        <field name="product_id" ref="product.product_product_1" />
+    </record>
     <record id="hr.employee_qdp" model="hr.employee">
         <field name="product_id" ref="product.product_product_1" />
     </record>