Fix typo in a comment

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@78268 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Remove unused member variable from wxSimpleCheckBox (used in wxPGCheckBoxEditor).

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@78269 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775