There is only one property in QSequentialAnimationGroup,
currentAnimation.
This patch ports this property to the new property system
Task-number: QTBUG-85520
Change-Id: Id528d30f551e88a6165bbb6a3c09d44e89257de5
Reviewed-by: Sona Kurazyan <sona.kurazyan@qt.io>
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>