Reset leash and content overlay if auto-enter-pip is aborted

This is to fix the edge case that Launcher has finished the
auto-enter-pip transition but app for some reason requests
setAutoEnterEnabled(false).

Video: http://recall/-/aaaaaabFQoRHlzixHdtY/dpmhNEgztWewX4kWNsk3n0
Bug: 191930787
Test: swipe up at the end of YT playback, see video
Change-Id: Ib95a1c046e0243f705b901c9bfabcf96e37cb0e6