fixed beacon variable name

salt/files/minion.d/beacons.conf

@@ -2,7 +2,7 @@
 # This file is managed by Salt! Do not edit by hand!
 #
 {%- set beacons = salt['pillar.get']('salt:beacons') -%}
-{%- set engines = salt['pillar.get']('salt:minion:beacons', default=engines, merge=True) -%}
+{%- set beacons = salt['pillar.get']('salt:minion:beacons', default=beacons, merge=True) -%}
 {%- if beacons %}
 beacons:
   {{ beacons | yaml(False) | indent(2) }}