The item being inserted is not inserted yet when we call
SetOwnerDrawnMenuItem() so we must call it separately for it after inserting
it.
Closes#15437.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74717 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775