services/tray: fix const lint in item

Author: outfoxxed

src/services/status_notifier/item.cpp

@@ -248,7 +248,7 @@ void StatusNotifierItem::onGetAllFinished() {
 	emit this->ready();
 }
 
-void StatusNotifierItem::onGetAllFailed() {
+void StatusNotifierItem::onGetAllFailed() const {
 	// Not changing the item to ready, as it is almost definitely broken.
 	if (!this->mReady) {
 		qWarning(logStatusNotifierItem) << "Failed to load tray item" << this->properties.toString();

src/services/status_notifier/item.hpp

@@ -75,7 +75,7 @@ class StatusNotifierItem: public QObject {
 private slots:
 	void updateIcon();
 	void onGetAllFinished();
-	void onGetAllFailed();
+	void onGetAllFailed() const;
 	void onMenuPathChanged();
 
 private: