Clean up the syntax.

Reviewed-on: ISTI-ansible-roles/ansible-role-docker#13

tasks/docker_setup.yml

@@ -70,6 +70,8 @@
         - Restart docker
 
 - name: Cron job that prunes all the docker system
+  when: docker_install
+  tags: [docker, docker_system_prune_all]
   block:
     - name: Install a script that prunes the entire docker system
       copy:
@@ -101,9 +103,6 @@
         job: "/usr/local/sbin/docker-system-prune-all"
       when: not docker_system_prune_all
 
-  when: docker_install
-  tags: [docker, docker_system_prune_all]
-
 - name: docker_setup | Cron job that restart docker daemon daily
   block:
     - name: docker_setup | Install a script that restart the docker daemon