Replace with_flattened by flatten jinja filter

tasks/main.yml

@@ -6,11 +6,9 @@
 # Server Manage required system packages [[[1
 - name: Ensure required packages are in there desired state
   package:
-    name: '{{ item }}'
+    name: '{{ xymon_server__base_packages | flatten }}'
     state: '{{ "present" if (xymon_server__deploy_state == "present") else "absent" }}'
     install_recommends: False
-  with_flattened:
-    - '{{ xymon_server__base_packages | to_nice_json }}'
   register: server_pkg_result
   until: server_pkg_result is success