Removing excess line with debug Console.WriteLine

I reported about a bug 22059 (https://bugzilla.xamarin.com/show_bug.cgi?id=22059). It was fixed in 68e5cc395fd19366ed8e421f2f329fcf91d2b0b0, but a excess line with debug Console.WriteLine
```
Console.WriteLine (iface.Attributes);
```
was added. I removed it.