Unbreak QtPrintersTest::testQString
Summary:
Someone changed the test clients without adapting the GDB printer
tests...
Reviewers: KDevelop
Subscribers: kdevelop-devel
Differential Revision: https://phabricator.kde.org/D9923
(cherry picked from commit f4dd6425f3436fec1a75736d59812eb7ce2a5ebb)