Migrated demo code to not import string module. (Patch from Kevin Altis)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_4_BRANCH@18718 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

wxPython/demo/wxTextCtrl.py

@@ -105,7 +105,7 @@ class TestPanel(wxPanel):
         start, end = self.tc.GetSelection()
         text = self.tc.GetValue()
         if wxPlatform == "__WXMSW__":  # This is why GetStringSelection was added
-            text = string.replace(text, '\n', '\r\n')
+            text = text.replace('\n', '\r\n')
         self.log.write("GetSelection(): (%d, %d)\n"
                        "\tGetStringSelection(): %s\n"
                        "\tSelectedText: %s\n" %