Don't show phonenumber if name is available

Summary:
Showing the number next to the name is neither pretty nor necessary IMHO.

My Android SMS app displays the number more subtle in an extra line below in gray. I could get behind something similar, but until this is implemented just don't show it

Depends on D16015

Reviewers: KDE Connect, sredman

Reviewed By: KDE Connect, sredman

Subscribers: sredman, kdeconnect

Tags: KDE Connect

Differential Revision: https://phabricator.kde.org/D16017