erp5: http monitor has no running cron - fix

stack/erp5/buildout.cfg

@@ -179,7 +179,7 @@ context =
 recipe = slapos.recipe.template
 filename = instance-http-monitor.cfg.in
 url = ${:_profile_base_location_}/${:filename}
-md5sum = 0186cfdf8a64036dff85411df8524138
+md5sum = 0d554238f7c61f08161c838bf7d80db4
 output = ${buildout:directory}/template-http-monitor.cfg.in
 
 ##################e

stack/erp5/instance-http-monitor.cfg.in

@@ -4,6 +4,7 @@ parts =
   certificate-authority
   cron-entry-monitor
   cron-entry-rss
+  cron
   deploy-index
   deploy-settings-cgi
   deploy-status-cgi