update web-dev-server hmr example to use lit v3 (#1)

Author: maerten

src/generators/wc-lit-element-ts/templates/static/web-dev-server.config.mjs

@@ -20,7 +20,7 @@ export default /** @type {import('@web/dev-server').DevServerConfig} */ ({
 
   plugins: [
     /** Use Hot Module Replacement by uncommenting. Requires @open-wc/dev-server-hmr plugin */
-    // hmr && hmrPlugin({ exclude: ['**/*/node_modules/**/*'], presets: [presets.litElement] }),
+    // hmr && hmrPlugin({ exclude: ['**/*/node_modules/**/*'], presets: [presets.lit] }),
   ],
 
   // See documentation for all available options