[automerge] Remove the previous animation split tasks container when recreating 2p: ea468e0a95

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/16692579

Bug: 197919703
Change-Id: I18e70b717a462bdee86093dd63e18f355c72163b
Merged-In: Iad8b9d9a0d75bdaaa2a7255a33208c2c0c3fc25b