[BREAKING CHANGE] Update VE core submodule to master (43a48cb) for window process cleanup

* Update size of save dialog earlier on, and swap back to save panel in
  save dialog on setup instead of ready to avoid scaling and sizing
  simultaneously
* Update use of closing/closed/opening/open events to use
  setup/ready/teardown events instead

New changes:
43a48cb [BREAKING CHANGE] Update OOjs UI to v0.1.0-pre (9f4f250f88) for window process cleanup

Bug: 65705
Bug: 65343
Bug: 60843
Change-Id: Idf6f85ae12f6ca80fde57a400cb5b11270938c1a