Put last used session marker in session directory

autoload/startify.vim

@@ -757,7 +757,7 @@ function! s:create_last_session_link(spath)
   if !has('win32') && a:spath !~# '__LAST__$'
     let cmd = printf('ln -sf %s %s',
           \ shellescape(a:spath),
-          \ shellescape(fnamemodify(a:spath, ':h') .'/__LAST__'))
+          \ shellescape(s:session_dir .'/__LAST__'))
     silent! call system(cmd)
     if v:shell_error
       echomsg "startify: Can't create 'last used session' symlink."