fix: show compiler message for older Svelte versions

Older Svelte versions did extend their compiler error from Error without marking the message property as enumerable. Therefore we need to explicitly add it to the destructuring.

Author: dummdidumm

packages/repl/src/lib/workers/bundler/index.ts

@@ -609,7 +609,7 @@ async function bundle({
 			server: null,
 			imports: null,
 			warnings: client.warnings,
-			error: { ...e }
+			error: { ...e, message: e.message } // not all Svelte versions return an enumerable message property
 		};
 	}
 }