Allow choosing a ringtone for FindMyPhone
Summary:
BUG: 379023
Let users choose a ring tone in the settings.
Test Plan: Open settings, choose a ringtone, search for device.
Reviewers: KDE Connect, albertvaka
Reviewed By: KDE Connect, albertvaka
Subscribers: mtijink, andyholmes, albertvaka, apol, KDE Connect
Tags: KDE Connect
Differential Revision: https://phabricator.kde.org/D10332