tst_qquickitem: Make exclusion more fine-grained.

Revert 764bd1cb0f8f2db4f84018890b9ebb8b42741789 .

Task-number: QTBUG-32664
Change-Id: Idbe476a3e34b584b12e653f23a36d58028a2bf21
Reviewed-by: Simo Fält <simo.falt@digia.com>
Reviewed-by: Alan Alpert <aalpert@blackberry.com>