D9084: Simplify MPRIS callback code

[Albert Vaca Cintora]

albertvaka accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R225 KDE Connect - Android application

BRANCH
  mpris-improve-callbacks

REVISION DETAIL
  https://phabricator.kde.org/D9084

To: mtijink, #kde_connect, albertvaka
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