Mark nordpool as service integration_type (home-assistant#157810)

Author: zweckj

homeassistant/components/nordpool/manifest.json

@@ -4,7 +4,7 @@
   "codeowners": ["@gjohansson-ST"],
   "config_flow": true,
   "documentation": "https://www.home-assistant.io/integrations/nordpool",
-  "integration_type": "hub",
+  "integration_type": "service",
   "iot_class": "cloud_polling",
   "loggers": ["pynordpool"],
   "quality_scale": "platinum",

homeassistant/generated/integrations.json

@@ -4511,7 +4511,7 @@
     },
     "nordpool": {
       "name": "Nord Pool",
-      "integration_type": "hub",
+      "integration_type": "service",
       "config_flow": true,
       "iot_class": "cloud_polling",
       "single_config_entry": true