Fix handler notification for mariadb-clustercheck

This was missed in the original patch.

Change-Id: I991b0563560cf4a0b1feb718951ffdf21ab81856

ansible/roles/mariadb/tasks/check-containers.yml

@@ -13,4 +13,4 @@
     - item.value.enabled | bool
   with_dict: "{{ mariadb_services }}"
   notify:
-    - restart mariadb
+    - "restart {{ item.key }}"