ddclient: Domeneshop - use '==' instead of 'is' (opnsense#3841)

Since Python 3.8, 'is' and 'is not' produce warnings when its
behavior is undefined by the language spec.

See: https://docs.python.org/3.8/whatsnew/3.8.html#changes-in-python-behavior

dns/ddclient/src/opnsense/scripts/ddclient/lib/account/domeneshop.py

@@ -67,15 +67,15 @@ def execute(self):
             response = requests.get(**req_opts)
 
             # Parse response and update state and log
-            if response.status_code is 204:
+            if response.status_code == 204:
                 if self.is_verbose:
                     syslog.syslog(
                         syslog.LOG_NOTICE,
                         "Account %s set new ip %s [%s] for %s" % (self.description, self.current_address, response.text.strip(), hostnames)
                     )
                 self.update_state(address=self.current_address, status=response.text.split()[0] if response.text else '')
                 return True
-            elif response.status_code is 404:
+            elif response.status_code == 404:
                 syslog.syslog(
                     syslog.LOG_ERR,
                     "Account %s failed to set new ip %s [%d - %s], because %s could not be found" % (