Fix: Resetting key binding to defaults now works correctly.

src/prefs/KeyConfigPrefs.cpp

@@ -352,6 +352,7 @@ void KeyConfigPrefs::OnDefaults(wxCommandEvent & e)
 {
    for (size_t i = 0; i < mNames.GetCount(); i++) {
       mManager->SetKeyFromIndex(i,mDefaultKeys[i]);
+      mNewKeys[i]=mDefaultKeys[i];
    }
    RepopulateBindingsList();
 }

src/prefs/PrefsDialog.cpp

@@ -273,6 +273,7 @@ void PrefsDialog::OnOK(wxCommandEvent & event)
       gAudacityProjects[i]->UpdatePrefs();
    }
 
+   gPrefs->Flush();
    EndModal(true);
 }