Fix problem with HDPI screens

On high dpi screens the thml was shown way too small, this let's it
scale properly.

src/main.cpp

@@ -31,6 +31,7 @@
 
 int main(int argc, char *argv[])
 {
+    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
     QGuiApplication app(argc, argv);
     app.setOrganizationName("Jeena");
     app.setOrganizationDomain("jeena.net");