Fix some issues with shelf jumping/duration

Don't use OvershootParams for 0 button mode, since that interpolator
assumes the shelf is moving in conjunction with recents/app window.
Instead, use OVERSHOOT_1_2 like we do when not flinging.

Also bound the duration when entering recents, since scroller
duration could be 750ms if we are snapping to the current page.
Now we cap at MAX_SWIPE_DURATION (350ms). This case is most likely
to be hit when ending a slow swipe near the final recents scale,
since in that case duration is close to 0 and the scroller duration
is taken instead.

Test:
- Artificially always detect a pause, fling up in 0 button mode;
  ensure shelf doesn't jump
- Either with the above artifical change in 0 button, or 2 button
  mode, end a swipe to recents near its final scale with a slight
  scroll to the right; ensure duration is 350 instead of 750

Bug: 132283018
Bug: 127783075
Change-Id: I8d5fbd0b30af21b9587fba47d141ba90b3b6e778