Use mAnimationType to decide if the insets of the first frame is visible

Previously, we used the visibility of the source from
mInitialInsetsState to decide if the insets of the first frame is
visible. However, the visibilities of sources in mInitialInsetsState
might have already been overridden by the control target, which might be
the state after the animation, not before.

This CL uses mAnimationType to decide if the insets of the first frame
is visible.

Fix: 307488639
Test: atest WindowInsetsAnimationTests WindowInsetsAnimationImeTests
Change-Id: I707259d977af1d4430e007bf73a4b3c1b148a4a7