Fix SharePlugin devices list

Summary: D12212 broke the devices list in the SharePlugin. No devices was shown even when there were devices available.

Test Plan: Open up share devices list with 0/1 devices available

Reviewers: KDE Connect, albertvaka

Reviewed By: KDE Connect, albertvaka

Subscribers: kdeconnect, KDE Connect

Tags: KDE Connect

Differential Revision: https://phabricator.kde.org/D12334