remove both "when: not mongodb_enabled" so prealloc files actually get deleted

See https://github.com/iiab/iiab/blob/master/roles/1-prep/tasks/computed_vars.yml#L63-L67 pasted in here:

- name: Turn on mongodb if sugarizer enabled
  set_fact:
    mongodb_install: True
    mongodb_enabled: True
when: sugarizer_enabled

The above 5 lines might be commented out as an experiment, to dump MongoDB entirely on a trial basis.

roles/mongodb/tasks/main.yml

@@ -52,14 +52,12 @@
     paths: /var/lib/mongodb/journal
     patterns: prealloc.*
   register: files_to_delete
-  when: not mongodb_enabled
 
 - name: delete prealloc files
   file:
     path: "{{ item.path }}"
     state: absent
   with_items: "{{ files_to_delete.files }}"
-  when: not mongodb_enabled
 
 - name: add mongodb to service list
   ini_file: dest='{{ service_filelist }}'