CP-76 FIX mobile requests bugs

- Increase delay between calls to avoid transaction issues
- Remove "S" state in children which is useless and brought the bug
- Other small improvements

sms_939/models/sms_child_request.py

@@ -65,8 +65,6 @@ def _take_child_from_website(self):
             self.write({"child_id": child.id, "state": "child_reserved"})
             child.hold_id.sms_request_id = self.id
             child.remove_from_wordpress()
-            if self.type == "sms":
-                child.write({"state": "S"})
 
             child.hold_id.with_delay().update_expiration_date(
                 fields.Datetime.to_string(datetime.now() + relativedelta(days=1))