kg: removes defunct operators FONEX and nexi for Kyrgyzstan

Kyrgyzstan mobile broadband providers FONEX and nexi no longer exist
and are officially defunct.

FONEX: http://www.fonex.kg/news/409 (defunct since 7th May 2016)
nexi: defunct since 2015 (relevant info
http://old.diesel.elcat.kg/lofiversion/index.php?t58548532-50.html)

https://bugzilla.gnome.org/show_bug.cgi?id=781707