fix pep8 violations in errorlist.py

scripts/errorlist.py

@@ -2,7 +2,7 @@
 
 from textwrap import indent
 
-import borg.archiver
+import borg.archiver  # noqa: F401 - need import to get Error and ErrorWithTraceback subclasses.
 from borg.helpers import Error, ErrorWithTraceback
 
 classes = Error.__subclasses__() + ErrorWithTraceback.__subclasses__()

setup.cfg

@@ -43,7 +43,6 @@ ignore = E226, W503
 # flake8 failures that appear with your change.
 per_file_ignores =
     docs/conf.py:E121,E126,E265,E305,E401,E402
-    scripts/errorlist.py:F401
     src/borg/archive.py:E122,E125,E127,E402,E501,F401,F405,W504
     src/borg/archiver.py:E126,E127,E128,E501,E722,E731,E741,F401,F405,W504
     src/borg/cache.py:E127,E128,E402,E501,E722,W504