Remove insignificant flag from working unit test.

This was missed during the earlier fixes to this test.

Task-number: QTBUG-22017
Change-Id: Ica5bac09b565439bd65bfc42e9614544a21a0637
Reviewed-by: Nedim Hadzic <nedimhadzija@gmail.com>
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>