Fix unnecessary service worker registration and preloading when logged out (#20341)

app/javascript/mastodon/main.js

@@ -25,6 +25,7 @@ function main() {
         import('mastodon/initial_state'),
       ]);
 
+      if (me) {
         const wb = new Workbox('/sw.js');
 
         try {
@@ -35,7 +36,6 @@ function main() {
           return;
         }
 
-      if (me) {
         const registerPushNotifications = await import('mastodon/actions/push_notifications');
 
         store.dispatch(registerPushNotifications.register());