Remove the logic that strips some text off the top of commander history if adding text to the bottom fails. This logic was a vestige from MSWLogo when the control was a simple edit control and Windows 95's edit control had a limit of how much text it could hold. This limit is no longer applicabale, since Windows 95 is not supported and the control is now a wxRichTextCtrl. As a result, the removing-from-top logic was effectively dead code.
