Fix typo (caught by mypy)

1 job for CoRA-ZynQ in 33 seconds (queued for 18 seconds)
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failed #1900
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00:00:33

 
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dmt/B_mappers/simulink_B_mapper.py:41:1: F401 '..commonPy.asnAST.AsnSequence' imported but unused
dmt/B_mappers/simulink_B_mapper.py:41:1: F401 '..commonPy.asnAST.AsnSet' imported but unused
dmt/B_mappers/simulink_B_mapper.py:41:1: F401 '..commonPy.asnAST.AsnMetaMember' imported but unused
dmt/B_mappers/simulink_B_mapper.py:51:1: F401 'os' imported but unused
dmt/B_mappers/simulink_B_mapper.py:458:12: F632 use ==/!= to compare constant literals (str, bytes, int, float, tuple)
make: *** [Makefile:24: flake8] Error 1
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ERROR: Job failed: exit code 1