[FIX] point_of_sale: add `forcecreate="0"` `pos_config_main`

Without this change, upgrades would generate the `pos_config_main`
record even in dbs with otherwise-well-organized structure.

Also, it might cause issues[^1] hard to solve otherwise.

[^1]: https://upgrade.odoo.com/web#active_id=421039&cids=1&id=421039&menu_id=107&model=upgrade.request&view_type=form



closes odoo/odoo#107609

Signed-off-by: Trinh Jacky (trj) <trj@odoo.com>

addons/point_of_sale/data/point_of_sale_data.xml

@@ -24,7 +24,7 @@
             <field name="taxes_id" eval="[(5,)]"/>
         </record>
 
-        <record model="pos.config" id="pos_config_main">
+        <record model="pos.config" id="pos_config_main" forcecreate="0">
             <field name="name">Shop</field>
             <field name="barcode_nomenclature_id" ref="barcodes.default_barcode_nomenclature"/>
         </record>