Changed connection editor to nm-connection-editor
Summary: Changed connection editor to nm-connection-editor from network-manager-gnome
Test Plan: check if nm-tray open nm-connection-editor instead of nmtui
Reviewers: wxl, tsimonq2
Reviewed By: wxl, tsimonq2
Subscribers: hmollercl
Differential Revision: https://phab.lubuntu.me/D16