correct SW field

config.sw should point to uv.sw.js, not the stock sw.js
we now use a fixed path in register-sw.js

public/register-sw.js

@@ -1,4 +1,9 @@
 "use strict";
+/**
+ * Distributed with Ultraviolet and compatible with most configurations.
+ */
+const stockSW = "/uv/sw.js";
+
 /**
  * Global util
  * Used in 404.html and index.html
@@ -7,7 +12,8 @@ async function registerSW() {
   if (!navigator.serviceWorker)
     throw new Error("Your browser doesn't support service workers.");
 
-  await navigator.serviceWorker.register(__uv$config.sw, {
+  // Ultraviolet has a stock `sw.js` script.
+  await navigator.serviceWorker.register(stockSW, {
     scope: __uv$config.prefix,
   });
 }

public/uv/uv.config.js

@@ -8,5 +8,5 @@ self.__uv$config = {
   handler: "/uv/uv.handler.js",
   bundle: "/uv/uv.bundle.js",
   config: "/uv/uv.config.js",
-  sw: "/uv/sw.js",
+  sw: "/uv/uv.sw.js",
 };