Prefer classic integration_type

Author: alepee

custom_components/heating_degree_days/manifest.json

@@ -9,7 +9,6 @@
     "recorder"
   ],
   "documentation": "https://github.com/alepee/hass-heating_degree_days",
-  "integration_type": "helper",
   "iot_class": "calculated",
   "issue_tracker": "https://github.com/alepee/hass-heating_degree_days/issues",
   "requirements": [],