fix dashboard certs secret

roles/kubernetes-apps/ansible/templates/dashboard.yml.j2

@@ -176,8 +176,10 @@ spec:
           # to it. Uncomment only if the default does not work.
           # - --apiserver-host=http://my-address:port
         volumeMounts:
+{% if not dashboard_use_custom_certs %}
         - name: kubernetes-dashboard-certs
           mountPath: /certs
+{% endif %}
           # Create on-disk volume to store exec logs
         - mountPath: /tmp
           name: tmp-volume
@@ -189,9 +191,11 @@ spec:
           initialDelaySeconds: 30
           timeoutSeconds: 30
       volumes:
+{% if not dashboard_use_custom_certs %}
       - name: kubernetes-dashboard-certs
         secret:
           secretName: kubernetes-dashboard-certs
+{% endif %}
       - name: tmp-volume
         emptyDir: {}
       serviceAccountName: kubernetes-dashboard