D8732: Fix race that starts kactivitymanagerd multiple times

[Aleix Pol Gonzalez]

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

REPOSITORY
  R6 KActivities

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D8732

To: davidedmundson, apol
Cc: apol, #frameworks