D11025: [taskmanager applet] Fix MPRIS buttons in tooltip for CanPause==false

[Friedrich W . H . Kossebau]

kossebau added a dependent revision: D10972: [RFC] Exposing slideshow to MPRIS 
controllers.

REPOSITORY
  R119 Plasma Desktop

REVISION DETAIL
  https://phabricator.kde.org/D11025

To: kossebau, broulik
Cc: plasma-devel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, 
sebas, apol, mart