Fix '<Validation hacsjson> failed: extra keys not allowed @ data['iot…

…_class']. Got ['Local Polling'] (More info: https://hacs.xyz/docs/publish/include#check-hacs-manifest )'

hacs.json

@@ -1,6 +1,5 @@
 {
   "name": "iDrac power monitor",
   "render_readme": true,
-  "iot_class": ["Local Polling"],
   "content_in_root": false
 }