chore: fix coding style

src/backend.cpp

@@ -339,9 +339,10 @@ void Backend::runDemoProject(const QString &projectName)
     const std::optional<QJsonArray> projectList = m_serviceConnector.fetchDemoList();
 
     if (projectList == std::nullopt) {
-        qCritical(
-            "Could not fetch demo project list. Please check your internet connection and try "
-            "again.");
+        qCritical()
+            << "Could not fetch demo project list. Please check your internet connection and "
+               "try "
+               "again.";
         emit popupClose();
         return;
     }