D20833: Simpler check for flatpak

[Aleix Pol Gonzalez]

apol added a comment.


  We still use it to check whether to initialise `portalDBusServiceExists`. I'll simplify it a bit.

REPOSITORY
  R289 KNotifications

REVISION DETAIL
  https://phabricator.kde.org/D20833

To: apol, #frameworks
Cc: broulik, kde-frameworks-devel, michaelh, ngraham, bruns
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