Adjust list of items for deferred deletion/removal if wxPG property item is actually deleted/removed.

When property is actually deleted/removed it must be also removed from the respective list of items for deferred deletion/removal in order to avoid crashes when it would be attempted to delete/remove it again at next wxPG idle state.
Because lists of items for deferred operations can be updated at every actual deletion/removal it is necessary to rearrange iteration through these lists in wxPG::OnIdle.

See #16222.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76889 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775