Allow intercept touch event while animating edge glow.

Bug: 185906621

During overscroll animation, there is no need to call
disallowInterceptTouchEvents(). This removed the
call so that parents can intercept touch events.

Test: Ia9ac6d81a5b60222f489ea87f31ecba0c1d48cea
Test: manual testing

Change-Id: Ie5d9428d95b86d7a976c2f3c519547151a45cec5