Border drawing corrections


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75878 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Corrected wxTextBoxAttr::IsDefault() implementation


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75879 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775