Cleanup of floatingMenuRadiiAnimation

Also changes radii interpolation from Bounce to Decelerate (it looks better)
https://recall.googleplex.com/projects/0021c271-5237-43a6-ad57-042138486435/sessions/6e7acbd5-5f55-4d33-bdf4-4bca47fbb18b

Test: N/A
Flag: N/A
Bug: 281140482
Change-Id: I54c82fcbad8c07155ffaf857fed084baaa90e8df