Update demo files. A minor code cleaning.

common/string.cpp

@@ -477,18 +477,3 @@ bool ReplaceIllegalFileNameChars( std::string* aName )
 
     return changed;
 }
-
-
-wxString RemoveTrailingZeros( const wxString& aString )
-{
-    wxString retv = aString;
-    int      i = retv.Length();
-
-    while( --i > 0 && retv[i] == wxChar( '0' ) )
-        retv.RemoveLast();
-
-    if( retv[i] == wxChar( '.' ) || retv[i] == wxChar( ',' ) )
-        retv.RemoveLast();
-
-    return retv;
-}