Remove reference to test before afterAll hook runs

[stonelgh]

Fix #2006

[danielstjules]

Given the example from #2006

describe('good test', function() {
  it('should not blame me', function() { });
});

describe('bad test', function() {
  before('fail init', function() {
    throw new Error();
  });

  it('skipped');
});

// Before PR:
1) bad test "before all" hook: fail init for "should not blame me":
// After PR:
1) bad test "before all" hook: fail init:

Looks good :) @stonelgh Could you add a test for this in https://github.com/mochajs/mocha/blob/master/test/integration/hook.err.js ? The fixture could just about be the code from your original issue.

[danielstjules]

Oh, didn't need to open a new PR - but I'll close this in favor of #2028 :)