[lib] Update the dev invite link URL

Summary: Update the dev invite link URL so that it works for the default configuration. Making it correct in all the cases is hard because we would need the `webapp_url.json` config that isn't available in `lib`.

Test Plan: Open the dev app and check if the link is displayed correctly and works.

Reviewers: kamil, inka

Reviewed By: kamil

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D13589

lib/facts/links.js

@@ -9,7 +9,7 @@ import { isDev } from '../utils/dev-utils.js';
 /* Invite Links */
 function inviteLinkURL(secret: string): string {
   if (isDev) {
-    return `http://localhost:3000/invite/${secret}`;
+    return `http://localhost:3000/webapp/invite/${secret}`;
   }
   return `https://comm.app/invite/${secret}`;
 }