Qt: Fix memleaks in tests
* lang/qt/tests/t-keylist.cpp(cleanupTestCase): Ensure that posted events are handled for autodeletion. (testSingleKeylistSync): delete job. * lang/qt/tests/t-ownertrust.cpp(cleanupTestCase): Ditto * lang/qt/tests/t-ownertrust.cpp(testChangeOwnerTrust): Delete keylistjobs. * lang/qt/tests/t-keylocate.cpp(cleanupTestCase): Ditto