Fix typo

git-svn-id: http://svn.wxwidgets.org/svn/wx/wxPython@73529 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
MaskedComboBox patch from Bill Tutt

git-svn-id: http://svn.wxwidgets.org/svn/wx/wxPython@73530 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
MaskedEditCtrl patch from Bill Tutt

git-svn-id: http://svn.wxwidgets.org/svn/wx/wxPython@73531 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775