Update example to work with latest pdfmake

[akravchukabto]

Hi, firstly, thank you for your work effort at this library.

I have noticed that when using the latest pdfmake the example does not work.
Line
pdfMake.vfs = pdfFonts.pdfMake.vfs;
throughs error
Uncaught TypeError: Cannot read properties of undefined (reading 'vfs')
as I found in this comment #bpampuch/pdfmake#2802 (comment)
changing this line to
pdfMake.vfs = pdfFonts.pdfMake;
will fix the issue.

I assume there is a need to update example.
Thanks.

[Aymkdn]

Thanks. I'll adjust it next week.