projection: use the supported QML load path

Desktop now stays within the QML engine API supplied by the pinned CXX-Qt release.

Source-Sha: c40b2289c485dec198d8e8d13d4005cb6183498d

Policy-Sha: c40b2289c485dec198d8e8d13d4005cb6183498d

Tree-Digest: e920395d09696b93852d5502e0d11f5e51b97d9d8e43d90d42c316bdd359d03b

desktop/src/main.rs

@@ -23,12 +23,6 @@ fn main() {
 
     let mut engine = QQmlApplicationEngine::new();
     if let Some(mut engine) = engine.as_mut() {
-        engine
-            .as_mut()
-            .on_object_creation_failed(|_, url| {
-                eprintln!("redflag-desktop: QML root failed to construct: {url}");
-            })
-            .release();
         engine.load(&QUrl::from("qrc:/qt/qml/com/redflag/desktop/qml/Main.qml"));
     }