Start shortcuts close animation where open left off.

- Before we always started the close animation at 0 instead of
  the previous open progress, which looked janky.
- Shortened the animations' durations and start delays to
  account for the fact that the open animation was only
  partially finished when the close animation started.

Bug: 30465231
Change-Id: I958ee5f4543dbf1185f3d0229c55fc1b51929655