fix: Use new location for demo course base XML file

This follows changes made in openedx/openedx-demo-course#47

Author: timmc-edx

provision-lms.sh

@@ -52,7 +52,7 @@ then
     echo "Skipping import of demo course. DEVSTACK_SKIP_DEMO is set to true"
 else
     docker compose exec -T lms bash -e -c 'git clone https://github.com/openedx/edx-demo-course.git /tmp/edx-demo-course'
-    docker compose exec -T lms bash -e -c 'source /edx/app/edxapp/edxapp_env && python /edx/app/edxapp/edx-platform/manage.py cms --settings=devstack_docker import /edx/var/edxapp/data /tmp/edx-demo-course && rm -rf /tmp/edx-demo-course'
+    docker compose exec -T lms bash -e -c 'source /edx/app/edxapp/edxapp_env && python /edx/app/edxapp/edx-platform/manage.py cms --settings=devstack_docker import /edx/var/edxapp/data /tmp/edx-demo-course/demo-course/course && rm -rf /tmp/edx-demo-course'
 fi
 
 demo_hashed_password='pbkdf2_sha256$20000$TjE34FJjc3vv$0B7GUmH8RwrOc/BvMoxjb5j8EgnWTt3sxorDANeF7Qw='