Update German example numbers in PhoneNumber validator test

I've just had a look at the `PhoneNumber` validator and wondered why with the following settings:

```php
$this->add(array(
    'name' => 'telephone',
    'required' => false,
    'validators' => array(
        array(
            'name' => 'Zend\I18n\Validator\PhoneNumber',
            'options' => array(
                'country' => 'DE',
                'allowed_types' => array(
                    'fixed',
                ),
            ),
        ),
    ),
);
```

it successfully validated the following numbers:

* `+441711234567`

I had a look at the test and updated the `phones` array for German phone numbers. Maybe I didn't understand it correctly how it is supposed to work (given that there is no documentation, only tests for it), but as far as I'm concerned, if you want to dial a number within Germany - other than `emergency` or `shortcode` numbers - you have to prefix them with `0` (unless you're dialing a number in the same city).

The test fails now, of course.

Debugging, I realized that the corresponding regular expression for `fixed` numbers 

```
/^[246]\d{5,13}|3(?:[03-9]\d{4,13}|2\d{9})|5(?:0[2-8]|[1256]\d|[38][0-8]|4\d{0,2}|[79][0-7])\d{3,11}|7(?:0[2-8]|[1-9]\d)\d{3,10}|8(?:0[2-9]|[1-9]\d)\d{3,10}|9(?:0[6-9]|[1-9]\d)\d{3,10}$/
```
 matches

* +441<i>711234567</i> - (it's a UK landline number, it shouldn't match)
* 01<i>71234567890</i> - (it's a DE mobile number, it shouldn't match)

@mwillbanks, can you have a look?