Revert^2 "Enable IME predictive back animation in all apps"

Bug: 341013064
Change-Id: I658ff7d76ccb1e020f8b722dec64199723e82c97
Test: atest FrameworksCoreTests:WindowOnBackInvokedDispatcherTest
Test: Manual, i.e. testing IME behaviour in test app when using onKeyPreIme.
4 files changed