fs,win: do not add a second trailing slash in readdir

Do not add a trailing slash if it was not removed by resolve in ToNamespacedPath. PR-URL: #59847 Fixes: #58223 Refs: #56110 Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: Stefan Stojanovic <stefan.stojanovic@janeasystems.com>

Author: Flarna

src/node_file.cc

@@ -1994,7 +1994,7 @@ static void ReadDir(const FunctionCallbackInfo<Value>& args) {
  ToNamespacedPath(env, &path);
 
 #ifdef _WIN32
- if (slashCheck) {
+ if (slashCheck && !path.ToStringView().ends_with("\\")) {
  size_t new_length = path.length() + 1;
  path.AllocateSufficientStorage(new_length + 1);
  path.SetLengthAndZeroTerminate(new_length);