Remove debug print from remove_fields

[homebysix]

remove_fields() has a leftover print("Array item: ", i) that fires for every element of every list passed through a model's .xml() method. It's been in there since the open source release.

We noticed it in an AWS Lambda that adds computers to a static group with update_static_computer_group_membership_by_id(). One run wrote about 1,900 lines of Array item: {'id': 1234} to CloudWatch alongside the real log output, and it grows with the size of the membership update. Since it's a print and not a logger call, there's no way to quiet it from the caller.

Thanks for considering!