Fixed missing method argument

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | 2.3
| Fixed tickets | 

Made similar to http://symfony.com/doc/2.3/cookbook/console/console_command.html#testing-commands
The `Application` class from the Console component doesn't expect a `Kernel` argument (unlike the one from the FrameworkBundle).