Always call wxView::Close() when closing it.

Always call wxView::Close() when closing it.

After wxDocView refactoring the behaviour has changed and wxView::Close() and
hence user-overriddable OnClose() called from it) was only called if the close
event could be vetoed. This broke code which relied on OnClose() being
executed in any case to perform some cleanup and was incompatible with 2.8 so
restore the old behaviour now.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@63747 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775