don't avoid no-window widgets in GTKUpdateCursor()
it doesn't work for things like multi-line text control where m_widget is a no-window GtkScrolledWindow

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@75761 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775