Fixing error calculating the top pinned activity.

- When the menu was open, we were not calculating the correct
  top-activity to determine whether to relaunch fullscreen or to show
  media controller actions for.  Also fixes a bad condition check
  where we were setting the expand to fullscreen flag incorrectly.

Bug: 33754261
Test: Open a PIP activity, try to launch it again from launcher while the menu is visible
Change-Id: I3fd3dfe83a017c76cca9709f29c08621b16fb088