style(backend): run black on entire backend

* fixes small style relica
7 jobs for !183 with fix/style in 3 minutes and 5 seconds (queued for 1 second)
detached
Status Job ID Name Coverage
  Check
passed #907395
docker
check_back

00:00:21

passed #907396
docker
check_front

00:01:25

 
  Test
failed #907397
docker
test_back

00:00:59

54.0%
passed #907398
docker
test_frontend

00:00:19

 
  Lint
skipped #907400
docker
eslint
skipped #907399
docker
flake8
 
  Svg Gen Docu
skipped #907401
docker
generate_UML_svg
 
Name Stage Failure
failed
test_back Test
external_data/models.py                                                4      0   100%
init_dev_data.py 2 2 0%
init_prod_data.py 2 2 0%
--------------------------------------------------------------------------------------
TOTAL 2646 1223 54%
Coverage HTML written to dir htmlcov

=============== 33 passed, 1 warnings, 39 error in 13.46 seconds ===============
ERROR: Job failed: exit code 1