Update WindowManagerService#setHideOverlayWindows

1) If there is only one application requesting hide overlay windows, its
   own overlay windows won't be hidden.
2) If there are more than one applications requesting hide overlay
   windows. All overlay windows will be hidden.

Test: cts
Bug: 359424300
Flag: com.android.window.flags.fix_hide_overlay_api
Change-Id: Id6ee1a910eca4b574e89e2ec14befc0fa6e2e375