erp5_web_renderjs_ui: improve precached file

I noticed that my service worker for ERP5JS is updated almost every day.

However, the cache date does not change:

CACHE_NAME = prefix + 'Mon, 16 Mar 2026 05:33:51 +0000',

After further testing, I found that when the order of elements in the precache list changee

causing the content of gadget_erp5_serviceworker.js to change

the service worker is updated in this case