Make sure jdenticon toggle is always initialized

src/UserSettingsPage.cpp

@@ -813,6 +813,8 @@ UserSettingsPage::UserSettingsPage(QSharedPointer<UserSettings> settings, QWidge
                 useIdenticon_ = new Toggle{this};
                 useIdenticon_->setChecked(settings_->useIdenticon());
         }
+        else
+            useIdenticon_ = nullptr;
 
         if (!settings_->tray()) {
                 startInTrayToggle_->setState(false);