Fix prometheus:server targeting in ceph-add-node

Change-Id: I656d8dcae5761664a6a654f05c5da8d9bda3365d
Fixes-bug: https://mirantis.jira.com/browse/PROD-19186
diff --git a/ceph-add-node.groovy b/ceph-add-node.groovy
index 92d61e0..e96ef81 100644
--- a/ceph-add-node.groovy
+++ b/ceph-add-node.groovy
@@ -75,6 +75,6 @@
         }
 
         salt.enforceState(pepperEnv, HOST, 'prometheus')
-        salt.enforceState(pepperEnv, 'I@prometheus', 'prometheus')
+        salt.enforceState(pepperEnv, 'I@prometheus:server', 'prometheus')
     }
 }