Add integration_type service to firefly_iii (home-assistant#159013)

Author: joostlek

homeassistant/components/firefly_iii/manifest.json

@@ -4,6 +4,7 @@
   "codeowners": ["@erwindouna"],
   "config_flow": true,
   "documentation": "https://www.home-assistant.io/integrations/firefly_iii",
+  "integration_type": "service",
   "iot_class": "local_polling",
   "quality_scale": "bronze",
   "requirements": ["pyfirefly==0.1.8"]

homeassistant/generated/integrations.json

@@ -1994,7 +1994,7 @@
     },
     "firefly_iii": {
       "name": "Firefly III",
-      "integration_type": "hub",
+      "integration_type": "service",
       "config_flow": true,
       "iot_class": "local_polling"
     },