Don't rely on playPause for MPRIS pause

Summary:
When pause is requested via MPRIS playPause is called internally. Plasma sends pause when the laptop lid is closed. Now, when Elisa is open, but paused and Plasma sends pause, playPause is resulting in play, making Elisa play for
a couple of seconds before the laptop suspends.

Test Plan: Check via DBUS inspector and by closing/opening lid.

Reviewers: Elisa, mgallien

Reviewed By: Elisa, mgallien

Subscribers: mgallien, Elisa

Tags: Elisa

Differential Revision: https://phabricator.kde.org/D11373