Fix export of Contrast data on Mac

src/effects/Contrast.cpp

@@ -541,11 +541,7 @@ void ContrastDialog::OnExport(wxCommandEvent & WXUNUSED(event))
       return;
 
    wxTextFile f(fName);
-#ifdef __WXMAC__
-   wxFile{}.Create(fName);
-#else
    f.Create();
-#endif
    f.Open();
    if (!f.IsOpened()) {
       AudacityMessageBox( XO("Couldn't write to file: %s").Format( fName ) );
@@ -611,11 +607,7 @@ void ContrastDialog::OnExport(wxCommandEvent & WXUNUSED(event))
    f.AddLine(wxT("==================================="));
    f.AddLine(wxT(""));
 
-#ifdef __WXMAC__
-   f.Write(wxTextFileType_Mac);
-#else
    f.Write();
-#endif
    f.Close();
 }