[Checkins] [zopefoundation/zope.testbrowser] 194236: Fix linting errors

[Jürgen Gmach]

  Branch: refs/heads/fix-lint
  Home:   https://github.com/zopefoundation/zope.testbrowser
  Commit: 194236bb7433cca1d2ace562c25342614cd2c067
      https://github.com/zopefoundation/zope.testbrowser/commit/194236bb7433cca1d2ace562c25342614cd2c067
  Author: Jürgen Gmach <juergen.gmach at googlemail.com>
  Date:   2020-05-17 (Sun, 17 May 2020)

  Changed paths:
    M src/zope/testbrowser/browser.py

  Log Message:
  -----------
  Fix linting errors

... which came along new flake8 version.

modified:   src/zope/testbrowser/browser.py