QtDeclarative: Add qt.tests.insignificant to OpenSuSE

There seems to be something wrong with OpenSUSE setup, so we need
to verify the stage before making the tests enforcing.

Change-Id: I4c5ed677bd5a60591f3f15828fe61d6a7c52ba77
Reviewed-by: Sergio Ahumada <sergio.ahumada@digia.com>