Fix etherpad unit restart handler

etherpad/handlers/main.yml

@@ -8,7 +8,7 @@
     daemon_reload: true
 
 - name: restart etherpad
-  debug:
-    var: item
-  when: item.value.changed
+  systemd:
+    name: "etherpad@{{ item.item.name }}.service"
+    state: restarted
   with_items: "{{ etherpad_config.results }}"