fresh_login_required doesn't work with FlaskLoginClient

[sopoforic]

Describe the bug
When using the FlaskLoginClient to test @fresh_login_required views, they always redirect to the refresh view rather than rendering as expected.

To Reproduce

1. Have a view with @fresh_login_required:

@app.route('/edit/')
@fresh_login_required
def edit():
    ...

2. Attempt to visit it with the test client:

app.test_client_class = FlaskLoginClient
with app.test_client(user=user, fresh_login=True) as client:
    r = client.get("/edit/")
    assert r.status_code == 200

Expected behavior
The request should succeed, since the login should be fresh.

Desktop (please complete the following information):

• OS: Linux
• Flask-Login version 0.6.1

Additional context
I suspect this is the same as bug #586.

[maxcountryman]

If this is a still an issue then please address with a proposed fix in the form of a PR.