fix: correct redirect when it loads webui (ipfs#2697)

Fix issue of invalid redirect to url 'http://undefined:9090/ipfs...'
when webui URL is loaded

License: MIT
Signed-off-by: ggarri <gabriel@lightstreams.io>

Author: ggarri

src/http/api/routes/webui.js

@@ -20,7 +20,7 @@ module.exports = [
         const address = multiaddr(gateway).nodeAddress()
 
         port = address.port
-        host = address.host
+        host = address.address
       } catch (err) {
         // may not have gateway configured
         log.error(err)