Set launch source info for shell recents animation

In legacy animation, it was set in RecentsAnimation
#startRecentsActivity. Now because shell transition use
startActivity, it can be set directly to the options.

Bug: 218847872
Test: adb shell setprop persist.debug.shell_transit 1; reboot
      Enable statsd log: "adb shell cmd stats print-logs"
      Swipe up gesture navigation bar from an app.
      adb logcat | grep statsd | grep "(48)"
      The line may contain 0x100000->4[I] 0x110000->20[I]
      that means 4=by recents and 20=latency 20ms.
Change-Id: Ia7bef23f8dc6cbf371cd1cdfb42f1f68d88d0787