Summary:
Notifications, QML Text and QLabel accept a HTML subset,
which does not make sense for device names.

BUG: 382243

Test Plan:
Sent a pair request and accepted it, device name
now shown as plain text everywhere.

Reviewers: #kde_connect, albertvaka

Reviewed By: #kde_connect, albertvaka

Subscribers: #kde_connect

Differential Revision: https://phabricator.kde.org/D6640