fix hard coded base URL

4 jobs for topic/default/editorjs-base-url in 1 minute and 9 seconds (queued for 21 seconds)
Name Stage Failure
black Tests
would reformat cubicweb_tuto/
Oh no! 💥 💔 💥
1 file would be reformatted, 11 files would be left unchanged.
ERROR: InvocationError for command /builds/cubicweb/cubes/tuto/.tox/black/bin/black --check . (exited with code 1)
___________________________________ summary ____________________________________
ERROR: black: commands failed
Running after_script
Uploading artifacts for failed job
ERROR: Job failed: command terminated with exit code 1