Fix crash on Android L and list view items.

This crash is visible on Android L. This patch removes the static_cast which caused the
crash and it also fixed the list view item problem. I could not create separated patches
because they depend too much on each other.

Task-number: QTBUG-42673
Task-number: QTBUG-41814
Change-Id: I5d3e9c2b73df8f0e87e815b785b1c64d65a3ffaf
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@theqtcompany.com>