Bug occurs when content[0] is a folder

```
📚 test.zip
   📁New_Folder
       🖼️image1.png
```

z.read() can read folders without password. So z.read(content[0]) which is New_Folder, returns true and not throw error. Loop immediately terminating without finding correct password.  Code should use first file (eg: file_name.file_extension) in content array instead of content[0]
