Only associate the same windowing mode to a transition info

Different windowing modes of launching activities are usually
independent launch events. In other words, the launch cookie
won't be transferred across windowing mode.

Bug: 190833924
Test: atest ActivityMetricsLaunchObserverTests# \
      testConsecutiveLaunchWithDifferentWindowingMode
Test: Launch from widget whose trampoline redirects to a bubble.
Change-Id: Ic95732e0ed7fbeaf57550d392e4b3f04a67e311f