Remove unused file

src/quickvnc/main.cpp

-#include <QGuiApplication>
-#include <QQmlApplicationEngine>
-
-int main(int argc, char *argv[])
-{
-    QGuiApplication app(argc, argv);
-
-    QQmlApplicationEngine engine;
-  //  const QUrl url(u"qrc:/remote_ui_project/main.qml"_qs);
-    const QUrl url(u"qrc:/remote_ui_project/minimal-compositor.qml"_qs);
-    QObject::connect(&engine, &QQmlApplicationEngine::objectCreated,
-                     &app, [url](QObject *obj, const QUrl &objUrl) {
-        if (!obj && url == objUrl)
-            QCoreApplication::exit(-1);
-    }, Qt::QueuedConnection);
-    engine.load(url);
-
-    return app.exec();
-}