Fix accessibility press action on the long term day item for iOS

This worked fine on Android because it synthesizes a mouseclick to the
MouseArea. This is not the case for accessibility on iOS.

Change-Id: Id7dd6402ba1388f617dc5f8b38dfab3a60776189
Reviewed-by: Jan Arve Sæther <jan-arve.saether@theqtcompany.com>
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@theqtcompany.com>