Exclude lit-server from being optimized (#1691)

This should get the lit example working from `npm`.

packages/renderers/renderer-lit/index.js

@@ -20,6 +20,7 @@ export default {
           '@webcomponents/template-shadowroot/template-shadowroot.js',
           'lit/experimental-hydrate-support.js',
         ],
+        exclude: ['@astrojs/renderer-lit/server.js']
       },
       ssr: {
         external: [