Stack trace filtering causing duplicate error messages

[Turbo87]

describe('foo', function() {
  it('bar', function() {
    throw new Error('this is a test in ' + process.cwd() + '/foo/bar/test.js and it fails');
  });
});

will output

  1) foo bar:
     this is a test in /Users/tbn/Code/tmp/mocha-stack-bug/foo/bar/test.js and it fails
  Error: this is a test in foo/bar/test.js and it fails
      at Context.<anonymous> (test/test.js:5:11)

and as you can see the this is a test in message is duplicated in the output. In this example it is not a big deal but once you have larger error messages this becomes really problematic (see BadgeLabs/mocha-eslint#29).

I've tracked this down to stackTraceFilter() being applied before the BaseReporter.list() method runs which removes the message from the stack property. But since the stack has been beautified the messages will no longer be equal due to the process.cwd() removal.