Correct else on cephadm_commands_post_default

Author: MoteHue

etc/kayobe/cephadm.yml

@@ -90,9 +90,11 @@ cephadm_commands_pre: "{{ cephadm_commands_pre_default + cephadm_commands_pre_ex
 cephadm_commands_post: "{{ cephadm_commands_post_default + cephadm_commands_post_extra }}"
 
 cephadm_commands_pre_default: []
-cephadm_commands_post_default:
 {% if kolla_enable_prometheus_ceph_mgr_exporter %}
+cephadm_commands_post_default:
   - "mgr module enable prometheus"
+{% else %}
+cephadm_commands_post_default: []
 {% endif %}
 
 cephadm_commands_pre_extra: []