proper naming and actually using the state

hardware/raspberrypi/init.sls

@@ -13,7 +13,7 @@ set has_fan = salt['pillar.get'](
 %}
 
 include:
-{%- if 'node_exporter' in has_promexporter %}
+{%- if has_promexporter %}
  - .prometheus-exporter
 {%- endif %}
 {%- if has_fan %}