Generated Makefile doesn't contain moc calls

1. Install Qt 6.2.2 from the installer
2. Install QtMultimedia QtRemoteObjects and QtInterfaceFramework
3. Open QtCreator
4. Open the qface-tutorial in <Qt>\Examples\6.2.2\interfaceframework\qface-tutorial
5. Build it

The build fails with undefined references to metaObject functions because moc files where not generated.
Checking the Makefile.debug in chapter4-simulation-behavior\backend_simulator shows no moc calls.

The example can be fixed by adapting the paths slightly:

1. Rename the backend_simulator.pro to backend.pro
2. Rename the backend_simulator folder to backend
3. Adapt the chapter4-simulation-behavior.pro to use the new backend folder

Because of the shorter path the moc calls show up in the Makefile and everything works fine.