Fix floating window activity result cancellation

Setting Intent.FLAG_ACTIVITY_NEW_TASK on *all* floating window intents
will result in Android dropping activity results for non-new task
activities trying to get results back.

Cheers,
SlimRoms

Change-Id: Ib125bd03733dc73859f7426150110d88319f7625

Conflicts:
	services/java/com/android/server/am/ActivityRecord.java