bundles/icinga2: remove unused code in hosts_template

bundles/icinga2/files/icinga2/hosts_template.conf

@@ -41,8 +41,6 @@ object Service "${service}" {
 %    if k not in {'import', 'command_on_monitored_host'} and not k.startswith('vars.notification'):
 %     if isinstance(v, bool) or isinstance(v, int) or k.endswith('_interval'):
     ${k} = ${str(v).lower()}
-%     elif isinstance(v, list):
-    ${k} = [${", ".join(['"' + i + '"' for i in v])}]
 %     else:
     ${k} = "${v}"
 %     endif