call GTKApplyWidgetStyle() from PostCreation() instead of GTKHandleRealized()
it's a better place to catch font or color changes made before creation

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@73361 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775