[FIX] base_setup: do not create deleted parameter

The base_setup.show_effect parameter is created at module installation (with
an external id) and is removed (and its external id) when the option
"Show Effect" is unchecked from the general setting.

When this option is checked again, the ir.config.parameter entry is recreated
but without an external id (as it is user-provided data, not from a data file).

When the module base_setup is updated, the record base_setup.show_effect is
recreated and the unicity constraint on ir.config.parameter is raised.

Set the record as forcecreate="False" to avoid recreating it when the module
is updated.
Anyway, if somebody uncheck the option, it is not expected to get it back when
the module is upgraded.

Fixes odoo/odoo#32806

closes odoo/odoo#32808

Signed-off-by: Raphael Collet (rco) <rco@openerp.com>

addons/base_setup/data/base_setup_data.xml

 <?xml version="1.0" encoding="utf-8"?>
 <odoo>
     <data noupdate="1">
-        <record model="ir.config_parameter" id="show_effect">
+        <record model="ir.config_parameter" id="show_effect" forcecreate="False">
             <field name="key">base_setup.show_effect</field>
             <field name="value">True</field>
         </record>