Fix hotseat translated upwards when dragging from all apps

Before, we just didn't scale or translate when entering spring loaded
state. That worked when dragging from home, but when dragging from all
apps it meant that the hotseat kept its translation from the transition
to all apps. Now we always move the hotseat to scale 1 and translation 0
when going to spring loaded mode.

Change-Id: I0630d5bb899e37e2ab01516adfc1b7e6f8a9e42a