fix: correct dir for enterprise-catalog provisioning

[pwnage101]

Noticed this on a fresh devstack:

Running migrations for enterprise-catalog...
bash: line 0: cd: /edx/app/enterprise-catalog/enterprise-catalog/: No such file or directory

and enterprise-catalog service wouldn't start because no migrations were run.

Sure enough, for whatever reason the directory has changed. Confirming by observation:

@pwnage101 ➜ /workspaces/devstack $ make enterprise-catalog-shell
docker compose exec enterprise-catalog /bin/bash
root@enterprise-catalog:/edx/app/enterprise-catalog# ls
api-compact.yaml   codecov.yml               docs                Makefile              pylintrc          README.rst        scripts    validate.sh
api.yaml           db_keyword_overrides.yml  enterprise_catalog  manage.py             pylintrc_tweaks   requirements      setup.cfg
catalog-info.yaml  docker-compose.yml        LICENSE             provision-catalog.sh  pytest.local.ini  requirements.txt  tox.ini