[FIX] service: initialize_db: correctly set country

When we are creating a database with a country code from the database manager,
the country is not set in the company, so when we install the accounting app, there
is no chart of account installed by default. We have this bug because
we are trying to put a country id in a field that should receive a
'res.country' record.

To fix this bug, we change the call of function read_search by a search
that will return a recordset.

Bug introduced in rev https://github.com/odoo/odoo/commit/1b59643d4b96195edcdbe1b1168a11a3b6d85483

odoo/service/db.py

@@ -56,7 +56,7 @@ def _initialize_db(id, db_name, demo, lang, user_password, login='admin', countr
                 modules.update_translations(lang)
 
             if country_code:
-                countries = env['res.country'].search_read([('code', 'ilike', country_code)], fields=['id'])
+                countries = env['res.country'].search([('code', 'ilike', country_code)])
                 if countries:
                     env['res.company'].browse(1).country_id = countries[0]