fixed setting global animation sync frame when started with ".init_event"

fixed setting global animation sync frame when started with ".init_event"

The previous code only handled adjusting the initial animation sync
frame when starting the animation using an "init delay" configuration
(starting the animation after a delay), but did not handle starting
the animation using an "init event" configuration (like triggering by
a click event or by a custom element change), in which case the sync
frame should also be reset.