Add integration_type service to fitbit (home-assistant#159015)

Author: joostlek

homeassistant/components/fitbit/manifest.json

@@ -5,6 +5,7 @@
   "config_flow": true,
   "dependencies": ["application_credentials", "http"],
   "documentation": "https://www.home-assistant.io/integrations/fitbit",
+  "integration_type": "service",
   "iot_class": "cloud_polling",
   "loggers": ["fitbit", "fitbit_web_api"],
   "requirements": ["fitbit==0.3.1", "fitbit-web-api==2.13.5"]

homeassistant/generated/integrations.json

@@ -2012,7 +2012,7 @@
     },
     "fitbit": {
       "name": "Fitbit",
-      "integration_type": "hub",
+      "integration_type": "service",
       "config_flow": true,
       "iot_class": "cloud_polling"
     },