actually start the event loop for Win32AnsiStdin

pkgs/cli_util/lib/src/windows/win32_stdin.dart

diff --git a/pkgs/cli_util/lib/src/windows/win32_stdin.dart b/pkgs/cli_util/lib/src/windows/win32_stdin.dart
index aa7823c..ae527ba 100644
--- a/pkgs/cli_util/lib/src/windows/win32_stdin.dart
+++ b/pkgs/cli_util/lib/src/windows/win32_stdin.dart
@@ -33,6 +33,7 @@
   void _startEventLoop() {
     if (_running) return;
     _running = true;
+    _eventLoop();
   }
 
   Future<void> _eventLoop() async {