QMessageAuthenticationCode autotest does not have data folder for
TESTDATA. It seems that pro file is copy/pasted from another one which
actually have data. Removed the unnecessary statement since it caused
problems for https://codereview.qt-project.org/77981.
Change-Id: Ide753e5692bd2f469217760173a9b60f2f646770
Reviewed-by: Andrew Knight <andrew.knight@digia.com>
Reviewed-by: Liang Qi <liang.qi@digia.com>