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)
latest merge request
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%
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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