tst_qfeedbackmmk: acknowledge crashing test.
tst_qfeedbackmmk: acknowledge crashing test.

b4d23e61ed19c770caf6b993a8ab0e4474d3f417 in qtbase changes QTest::qWait
to also handle DeferredDelete events.  This has triggered a crash in
this test.  Mark the test as insignificant until the problem is handled,
to unblock integrations.

Task-number: QTBUG-22779
Change-Id: I85e5553920774a9855bf831306d0d9a59aa20c35
Sanity-Review: Qt Sanity Bot <5581206bb7e0307f0d99eb71898ae6b694149ca5@ovi.com>
Reviewed-by: Jason McDonald <40c1146f72b16acca7bc08c70880d435c5d12691@nokia.com>

maui-packages/qtfeedback,maui-packages/qtfeedback