[18.0][FIX] base_substate: fix window action view violation during migration

[StefanRijnhart]

Fixes

psycopg2.errors.UniqueViolation: duplicate key value violates unique constraint "act_window_view_unique_mode_per_action"
DETAIL:  Key (act_window_id, view_mode)=(755, list) already exists.

odoo.tools.convert.ParseError: while parsing /home/odoo/odoo18/src/server-ux/base_substate/views/base_substate_type_views.xml:67, somewhere inside
<record id="act_open_base_substate_type_view_list" model="ir.actions.act_window.view">
        <field name="act_window_id" ref="act_open_base_substate_type_view"/>
        <field name="sequence" eval="10"/>
        <field name="view_mode">list</field>
        <field name="view_id" ref="base_substate_type_view_list"/>
    </record>

after updating the module on a database that was migrated using Odoo's enterprise upgrade service.