[CodeStyle][E231] update flake8 config (#47298)

* [CodeStyle][E231] update flake8 config

* empty commit, test=document_fix

.flake8

@@ -16,7 +16,7 @@ exclude =
     ./python/paddle/fluid/tests/unittests/mlu/**
 ignore =
     # E, see https://pycodestyle.pycqa.org/en/latest/intro.html#error-codes
-    E203,E231,E262,E265,E266,
+    E203,E262,E265,E266,
     E401,E402,
     E501,
     E711,E712,E721,E722,E731,E741,