LibCore: Remove unused Directory::create_iterator() method

Author: https://github.com/AtkinsSJ
Commit: ceaed7440e
Pull-request: https://github.com/SerenityOS/serenity/pull/17694

Userland/Libraries/LibCore/Directory.cpp

@@ -93,9 +93,4 @@ ErrorOr<struct stat> Directory::stat() const
     return System::fstat(m_directory_fd);
 }
 
-ErrorOr<DirIterator> Directory::create_iterator() const
-{
-    return DirIterator { path().string() };
-}
-
 }