Revert "Fix IME not shown from recents to split-screen task"

This reverts commit a210826f.

Reason for revert: DroidMonitor: Potential culprit for Bug b/260534444 - verifying through ABTD before revert submission. This is part of the standard investigation process, and does not mean your CL will be reverted.

Change-Id: Id88fe6e3a4f9eea08aa812feaae92067be40950f