Qt: Delete some redundant code in GameListModel

The settings are already modified by the caller.
The cover cache is cleared by refreshCovers().

src/duckstation-qt/gamelistwidget.cpp

@@ -150,17 +150,10 @@ GameListModel::~GameListModel() = default;
 
 void GameListModel::setShowLocalizedTitles(bool enabled)
 {
-  if (m_show_localized_titles == enabled)
-    return;
-
   m_show_localized_titles = enabled;
 
-  Host::SetBaseBoolSettingValue("UI", "GameListShowLocalizedTitles", enabled);
-  Host::CommitBaseSettingChanges();
-
-  // emit cover changed as well since the autogenerated covers will differ
   emit dataChanged(index(0, Column_Title), index(rowCount() - 1, Column_Title), {Qt::DisplayRole});
-  m_cover_pixmap_cache.Clear();
+  // emit cover changed as well since the autogenerated covers will differ
   refreshCovers();
 }