Dismiss split-screen when PiP is part of OPEN

When a transition with type other than TRANSIT_PIP arrives
DefaultMixedHandler, make DefaultMixedHandler can recognize the PiP
change in it, and follow the same path as swiping Split-Screen to PiP.

Flag: com.android.wm.shell.enable_pip2
Bug: 442285073
Video: http://recall/-/aaaaaabFQoRHlzixHdtY/3BPzQbuvE49PmCmAysQK7
Test: Launch app over split-screen with pip-able app, see Video
Change-Id: Iaadb0f11df54eb7fa658850a990ea9c5ccd05654