Add missing flow_title to doorbird (#33557)

When placeholders are in use, flow_title needs to be
set in the json to prevent an empty name in the
integrations dashboard. This affected doorbirds
that were found via ssdp.

homeassistant/components/doorbird/.translations/en.json

@@ -21,7 +21,8 @@
                 "title": "Connect to the DoorBird"
             }
         },
-        "title": "DoorBird"
+        "title": "DoorBird",
+        "flow_title" : "DoorBird {name} ({host})"
     },
     "options": {
         "step": {

homeassistant/components/doorbird/strings.json

@@ -27,6 +27,7 @@
          "not_doorbird_device": "This device is not a DoorBird"
       },
       "title" : "DoorBird",
+      "flow_title" : "DoorBird {name} ({host})",
       "error" : {
          "invalid_auth" : "Invalid authentication",
          "unknown" : "Unexpected error",