Path assignment in create_stack

The variable `stack_full_path` is appended to `out`, but never defined. I guess it should be `stack_file_path`?

https://github.com/SchapiroLabor/macsima2mc/blob/aa686aa767a128ad52d8ddb10696cce4204856b5/macsima2mc/tools.py#L360C13-L360C53