Fix: example deployment

Some of the qml examples did not work after 'cmake --install .'. This
was due to examples using qt_generate_deploy_app_script instead of
qt_generate_deploy_qml_app_script. This caused it to miss qml
dependencies.

Pick-to: 6.12
Fixes: QTBUG-149852
Fixes: QTBUG-149851
Change-Id: I85cd5942a9bcfdbc299a6c0ca7a82a8938a1b619
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>