Restore existing logic to keep restoring-transient-launch tasks as CHANGE transition

- This doesn't seem to be an issue anymore (perhaps with ag/30166499),
  things that are already visible should be CHANGE transitions otherwise
  we will run the surface setup code which can reset their position
  and other properties.

  The existing mRestoringTransientHide is still necessary to ensure that
  the right transient hide tasks are included in the transition (and
  only used when the flag is on)

Bug: 30166499
Flag: com.android.wm.shell.enable_recents_bookend_transition
Test: atest  WmTests:TransitionTests  WmTests:WindowOrganizerTests  TaplTestsTaskbarSearch#testLaunchSearchWebSuggestionInSplitscreen  TaplTestsTaskbar#testLaunchShortcutInSplitscreen  TaplTestsSplitscreen#testSaveAppPairMenuItemOrActionExistsOnSplitPair
Change-Id: Id8631b29b36d36c109643ce8680c42b99dbbf642