chore: remove unused MAX_WALLET_DEFAULT_ZAP import from app.js

Removes the unused `MAX_WALLET_DEFAULT_ZAP` import from `js/app.js` to improve code health and reduce confusion. This variable was imported from `config.js` but never used within `app.js`.

Verification:
- Confirmed `MAX_WALLET_DEFAULT_ZAP` is not present in `js/app.js`.
- Ran `tests/app/is-user-logged-in.test.mjs` to ensure `js/app.js` still loads and functions correctly.

Co-authored-by: PR0M3TH3AN <[email protected]>

js/app.js

@@ -9,7 +9,6 @@ import {
   ADMIN_SUPER_NPUB,
   ADMIN_DM_IMAGE_URL,
   BITVID_WEBSITE_URL,
-  MAX_WALLET_DEFAULT_ZAP,
   ALLOW_NSFW_CONTENT,
 } from "./config.js";
 import { accessControl } from "./accessControl.js";