Fix the scale for entering PiP animation

The entering PiP animation used to overscale when entered from large
screen landscape mode.

Video: http://recall/-/aaaaaabFQoRHlzixHdtY/hMdoi9O3JEDSMvB9qqFNrc
Video: http://recall/-/aaaaaabFQoRHlzixHdtY/jpZQhYk17hPEnWnWtjeRR
Bug: 201824622
Test: Entering PiP from large screen, landscape and portrait, in both \
      button and gesture navigation mode. See also the video
Change-Id: Ic4a4c2a8e83f794a999d8a91c6ebdb03537011f3