[kioslave/desktop] Attempt at making test more robust
Summary:
We have an unstable test.
KCoreDirLister has a timer involved set to 200ms
QTRY_VERIFY will fire when we have one change from the spy, but maybe
not everything if we explicitly wait and process maybe it will improve
things?
It's a bit of a random shot-in the dark.
Test Plan: Passes locally..but it always passed locally before
Reviewers: Plasma, kmaterka
Reviewed By: kmaterka
Subscribers: kmaterka, plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D28183