Generated incorrect webpack-stats.json path

Description While executing make run-django-webpack-devserver command to run Software Heritage, a server error appears at http://127.0.0.1:5004/ due to the incorrect generated path of webpack-stats.json.

Expected Behaviour The correct path should locate the file at /home/priya/swh/swh-environment/swh-web/static/webpack-stats.json but the generated file is found at /home/priya/swh/static/webpack-stats.json. However, when the file is manually copied and pasted to the right location, it works fine.

Environment Ubuntu 20.04 LTS

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Migrated from T4190 (view on Phabricator)