Bug: Windows -> linux 'send' results in incorrect filenames / not being extracted to a folder

When doing `runpodctl send folder_name` from a windows box to a linux box, when the linux side extracts the zip, the files are extracted as `folder_name\file_name.jpg`. expected behavior would be `folder_name/file_name.jpg`, placing the extracted files into the folder_name folder, instead of prepending it. 