clean up sw registration

static/sw.js

@@ -4,12 +4,14 @@ import "./scramjet.config.js";
 
 const scramjet = new ScramjetServiceWorker();
 
-self.addEventListener("fetch", async (event) => {
-    event.respondWith((async() => {
+async function handleRequest(event) {
     if (scramjet.route(event)) {
-            return await scramjet.fetch(event);
-        } else {
-            return await fetch(event.request);
+        return scramjet.fetch(event);
     }
-    })())
+
+    return fetch(event.request)
+}
+
+self.addEventListener("fetch", (event) => {
+    event.respondWith(handleRequest(event));
 });