Workaround crash on lockscreen close
Summary:
See QTBUG-55460 for details. It's causing our unit test crash when
closing the lock screen with SIGTERM.
It's not worth fixing "properly" as it goes away with QtQuickControls2
Test Plan:
gdb showed it was this crash, which I'd seen before
Ran locker --test
sent SIGTERM
locker closed, but didn't crash
Reviewers: Plasma
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D8100