Fix access to dictionary variable "server"

Change-Id: Ib8ed5b0a7020f44bf01f23c37702dac1fe6371c9
Closes-Bug: #1903272
diff --git a/neutron_tempest_plugin/scenario/base.py b/neutron_tempest_plugin/scenario/base.py
index b2f9af3..c7c5459 100644
--- a/neutron_tempest_plugin/scenario/base.py
+++ b/neutron_tempest_plugin/scenario/base.py
@@ -475,7 +475,7 @@
     def wait_for_guest_os_ready(self, server, client=None):
         if not CONF.compute_feature_enabled.console_output:
             LOG.debug('Console output not supported, cannot check if server '
-                      '%s is ready.', server['server']['id'])
+                      '%s is ready.', server['id'])
             return
 
         client = client or self.os_primary.servers_client