Polish YT auto enter PiP transition

- Fixed the round corner radius calculation, take into account the
  insets, was applied to the destination bounds side
- Adjust the leash position based on the insets

Video: http://recall/-/aaaaaabFQoRHlzixHdtY/eUpkH2il1vYBVBPt1Vks2u
Bug: 190748719
Test: auto-enter-pip from YT landscape, see video
Change-Id: I2f3f4ae807630c5ae6bcc9968c6b46cf4501ad07