[pens] fix number of segments reported in stats

[anthrotype]

It appears we were reporting the 'stats' differently in the pens and in the main ufo module.

https://github.com/googlei18n/cu2qu/blob/7a2f638/Lib/cu2qu/ufo.py#L148

You can git blame me, sorry. Funny how it's been broken for almost two years :)