Fixes a couple of issues with the tests.
Also, a type in prefs.h is "short" while it's actually
a boolean, this made me write the wrong testcase for this.
Fixed this by setting the Qt wrapper to bool, but I didn't
changed the c implementation because I tought I could break
something.
Signed-off-by: Tomaz Canabrava <tcanabrava@kde.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>