[applet] Improve tooltip text for single connected device use case
Summary:
Also fixes the bug that was making the popup be too wide in this case because we're no
longer using a newline in the text (will fix that for the multi-device case in another
patch later).
Test Plan:
Before:
After:
Reviewers: VDG, Plasma, drosca, nicolasfella
Reviewed By: nicolasfella
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D28997