Dockle accept files points at wrong path

When an app name that isn't "app" is specified for the template, the dockle accept files in `template/{{app_name}}/.dockleconfig.jinja` are incorrect. That settings.py file is always at `app/.venv/lib/python3.13/site-packages/apiflask/settings.py` regardless of the app name because the working directory in the Dockerfile is always "app". 