VisD update for the PipAppIconOverlay

- Use the same IconProvider Launcher is using to ensure the identical
  shadow / elevation is set
- Use the same icon size (66dp) Launcher is using for practical /
  reasonable device profile

Video: http://recall/-/aaaaaabFQoRHlzixHdtY/blaCMAiD9NQCIFj1V4i8qQ
video: http://recall/-/aaaaaabFQoRHlzixHdtY/gqHVRIePASh13Kk7wMeewa
Bug: 271912318
Test: manual in both light and dark thems, see the videos
Change-Id: I45e45e7ade5c0d4af031969ea783c24afdb6b412