Fix a nagios task, where a loop was not correctly declared.

library/roles/nagios/tasks/dell-omsa.yml

@@ -73,7 +73,8 @@
   tags: [ 'dell', 'nagios' ]
 
 - name: Install some standalone plugins
-  copy: src={{ nagios_dell_standalone_checks }} dest={{ nagios_local_plugdir }}/{{ item }} owner=root group=nagios mode=0750
+  copy: src={{ item }} dest={{ nagios_local_plugdir }}/{{ item }} owner=root group=nagios mode=0750
+  with_items: '{{ nagios_dell_standalone_checks }}'
   tags: [ 'dell', 'nagios' ]
 
 - name: Install a cron job that removes the leaked semaphores created by the nagios check of Dell hardware status