[FIX] sale_timesheet: fix incoherent demo data

The uom unit of a product on a sale order line was not with the product uom.
As a result, an error would be triggered when trying to edit the SO, without the
possibility to fix it (as the field is not in the view).
Odoo takes a stand against incorrect demo data.

opw 1906315

closes odoo#28641

addons/sale_timesheet/data/sale_service_demo.xml

@@ -6,7 +6,7 @@
             <field name="order_id" ref="sale.sale_order_3"/>
             <field name="name">Advance</field>
             <field name="product_id" ref="sale.advance_product_0"/>
-            <field name="product_uom" ref="uom.product_uom_day"/>
+            <field name="product_uom" ref="uom.product_uom_unit"/>
             <field name="price_unit">150.0</field>
             <field name="product_uom_qty">5.0</field>
         </record>