fix($animateCss): cancel fallback timeout when animation ends normally

Previously, css animations would not cancel the timeout when the
animation ends normally (calling end explicitly / transitionEnd event).
This meant that the timeout callback fn was always called after 150% of
the animation time was over. Since the animation was already closed at this
point, it would not do any work twice, but simply remove the timer data
from the element.
This commit changes the behavior to cancel the timeout and remove the data
when it is found during animation closing.

Closes #13787