fix(pwa) fix PWA worker script origin

Looks like the base it's still applied, so use a full URL.

index.html

 
             if (shouldRegisterWorker) {
                 navigator.serviceWorker
-                    .register('/pwa-worker.js')
+                    .register(window.location.origin + '/pwa-worker.js')
                     .then(reg => {
                         console.log('Service worker registered.', reg);
                     })