Appearance on OSX is now back to normal or better

Some additional wx3 cleanup as well.

src/export/ExportPCM.cpp

@@ -558,14 +558,6 @@ int ExportPCM::Export(AudacityProject *project,
        ((sf_format & SF_FORMAT_TYPEMASK) == SF_FORMAT_WAV))
       AddID3Chunk(fName, metadata, sf_format);
 
-#ifdef __WXMAC__
-#if !wxCHECK_VERSION(3, 0, 0)
-   wxFileName fn(fName);
-   fn.MacSetTypeAndCreator(sf_header_mactype(sf_format & SF_FORMAT_TYPEMASK),
-                           AUDACITY_CREATOR);
-#endif
-#endif
-
    return updateResult;
 }