Ensure sendUserLeaveHint be false when split from Overview

This is to ensure that we do not enter PiP when the user intention is to
create split-screen.

Video: http://recall/-/aaaaaabFQoRHlzixHdtY/gSDHKaYxyTEQ6665rr4lt9
Video: http://recall/-/aaaaaabFQoRHlzixHdtY/hTmOVfZDExC14JaJ5fXAZf
Bug: 234070451
Test: Split from menu option when in Overview in both folded and \
      unfolded states, see also videos
Change-Id: Id0a2470f9b37cae2e0897d0570f68909c995f8e0