software/js-drone: fix missing software response

software/js-drone/instance-output-schema.json

+{
+  "$schema": "http://json-schema.org/draft-04/schema#",
+  "description": "Values returned by drone swarm (default) instantiation",
+  "additionalProperties": false,
+  "properties": {},
+  "type": "object"
+}

software/js-drone/software.cfg.json

@@ -8,6 +8,7 @@
       "software-type": "default",
       "description": "Default",
       "request": "instance-input-schema.json",
+      "response": "instance-output-schema.json",
       "index": 0
     }
   }