Fix passing incorrect 'this' pointer to quitRunningApp()

This worked before due to Qt behavior that was changed in https://codereview.qt-project.org/c/qt/qtdeclarative/+/450393
to generate a warning in this situation. The old behavior remains the default, but this change avoids a warning in the logs.

app/gui/CliStartStreamSegue.qml

@@ -85,7 +85,7 @@ Item {
 
         function quitApp() {
             var component = Qt.createComponent("QuitSegue.qml")
-            var params = {"appName": appName, "quitRunningAppFn": launcher.quitRunningApp}
+            var params = {"appName": appName, "quitRunningAppFn": () => launcher.quitRunningApp()}
             stackView.push(component.createObject(stackView, params))
         }