[FIX] stock,mrp,purchase: remove demo right

Before [1] the demo user only has the basic right. Now it has
the administrator rights and it prevent an easy testing for user
flow.

The demo and admin users get their rights from the common
template with administrator right everywhere. Since it's a
data, we could just remove the administrator level and set
the user level in the demo data.

[1] commit 121cd0d608

X-original-commit: 7b7fdf5d4eb892bfd3c2fdb575264025dca21ca5
Part-of: odoo/odoo#131707

addons/mrp/data/mrp_demo.xml

@@ -3,7 +3,7 @@
     <data noupdate="1">
 
         <record id="base.user_demo" model="res.users">
-            <field eval="[(4, ref('group_mrp_user'))]" name="groups_id"/>
+            <field eval="[(3, ref('group_mrp_manager')), (4, ref('group_mrp_user'))]" name="groups_id"/>
         </record>
 
         <!-- Resource: res.company -->

addons/purchase/data/purchase_demo.xml

@@ -3,7 +3,7 @@
     <data noupdate="1">
 
         <record id="base.user_demo" model="res.users">
-            <field eval="[(4, ref('group_purchase_user'))]" name="groups_id"/>
+            <field eval="[(3, ref('group_purchase_manager')), (4, ref('group_purchase_user'))]" name="groups_id"/>
         </record>
 
         <record id="base.res_partner_1" model="res.partner">

addons/purchase_requisition/data/purchase_requisition_demo.xml

@@ -1,10 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <odoo>
     <data noupdate="1">
-        <record id="base.user_demo" model="res.users">
-            <field eval="[(4, ref('purchase.group_purchase_user'))]" name="groups_id"/>
-        </record>
-
         <!--Blanket Order Agreement-->
         <record id="bo_requisition" model="purchase.requisition">
             <field name="user_id" ref="base.user_admin"/>

addons/stock/data/stock_demo.xml

@@ -3,7 +3,7 @@
     <data noupdate="1">
 
         <record id="base.user_demo" model="res.users">
-            <field eval="[(4, ref('group_stock_user'))]" name="groups_id"/>
+            <field eval="[(3, ref('group_stock_manager')), (4, ref('group_stock_user'))]" name="groups_id"/>
         </record>
          <record id="lot_product_27" model="stock.lot">
             <field name="name">0000000000029</field>