Add new ZBT-2 VID:PID pair for discovery (home-assistant#154036)

Author: puddly

homeassistant/components/homeassistant_connect_zbt2/manifest.json

@@ -13,6 +13,12 @@
       "pid": "4001",
       "description": "*zbt-2*",
       "known_devices": ["ZBT-2"]
+    },
+    {
+      "vid": "303A",
+      "pid": "831A",
+      "description": "*zbt-2*",
+      "known_devices": ["ZBT-2"]
     }
   ]
 }