[autotests] Compare booleans to booleans

Summary:
Compiler errors:

17:06:23 /usr/lib64/gcc/x86_64-suse-linux/8/../../../../x86_64-suse-linux/bin/ld: CMakeFiles/testDataDevice.dir/test_datadevice.cpp.o: in function `TestDataDevice::testDrag()':
17:06:23 /home/jenkins/workspace/Frameworks kwayland kf5-qt5 SUSEQt5.9/autotests/client/test_datadevice.cpp:290: undefined reference to `bool QTest::qCompare<int, bool>(int const&, bool const&, char const*, char const*, char const*, int)'
17:06:23 /usr/lib64/gcc/x86_64-suse-linux/8/../../../../x86_64-suse-linux/bin/ld: CMakeFiles/testDataDevice.dir/test_datadevice.cpp.o: in function `TestDataDevice::testDragInternally()':
17:06:23 /home/jenkins/workspace/Frameworks kwayland kf5-qt5 SUSEQt5.9/autotests/client/test_datadevice.cpp:369: undefined reference to `bool QTest::qCompare<int, bool>(int const&, bool const&, char const*, char const*, char const*, int)'

Test Plan: Ran testDataDevice, still passes.

Reviewers: KWin, romangg, broulik

Reviewed By: broulik

Subscribers: kde-frameworks-devel

Tags: Frameworks

Differential Revision: https://phabricator.kde.org/D15330