Add integration_type device to droplet (home-assistant#158933)

Author: joostlek

homeassistant/components/droplet/manifest.json

@@ -4,6 +4,7 @@
   "codeowners": ["@sarahseidman"],
   "config_flow": true,
   "documentation": "https://www.home-assistant.io/integrations/droplet",
+  "integration_type": "device",
   "iot_class": "local_push",
   "quality_scale": "bronze",
   "requirements": ["pydroplet==2.3.4"],

homeassistant/generated/integrations.json

@@ -1448,7 +1448,7 @@
     },
     "droplet": {
       "name": "Droplet",
-      "integration_type": "hub",
+      "integration_type": "device",
       "config_flow": true,
       "iot_class": "local_push"
     },