Fix ordering of Prometheus config

gitlab/gitlab-deployment.yml

@@ -126,8 +126,8 @@ spec:
             gitlab_ci['builds_directory'] = '/gitlab-data/builds'
             gitlab_rails['registry_path'] = '/gitlab-registry'
-            prometheus['listen_address'] = '0.0.0.0:9090'
             prometheus['enable'] = true
+            prometheus['listen_address'] = '0.0.0.0:9090'
             node_exporter['enable'] = true
             gitlab_monitor['enable'] = true
             postgres_exporter['enable'] = true