updated salt-master config template to add presence_events setting

salt/files/master.d/_defaults.conf

@@ -826,3 +826,7 @@ rest_cherrypy:
   {{ name }}: {{ value }}
   {%- endfor %}
 {%- endif %}
+
+#####        presence events         #####
+##########################################
+{{ get_config('presence_events', 'False') }}