kalendarac: set AA_EnableHighDpiScaling attribute before constructing QGuiApplication

(cherry picked from commit cb8e88e6)

reminder-daemon/kalendaracmain.cpp

@@ -12,10 +12,13 @@
 
 int main(int argc, char **argv)
 {
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
+    // set this attribute before contructing QGuiApplication
+    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
+#endif
     QGuiApplication app(argc, argv);
     app.setQuitOnLastWindowClosed(false);
 #if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
-    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
     app.setAttribute(Qt::AA_UseHighDpiPixmaps, true);
 #endif